May 15, 2024 · Key Takeaways: List of the Elements. Every hydrogen atom has one proton in its nucleus. Beryllium is a member of the family of alkaline earth metals and lies at the top of group two (former group 2A) of the periodic table, just above magnesium. " Nov 21, 2020 · Atomic Number of Beryllium. Beryllium: Symbol: Be: Atomic Number: 4: Atomic Weight: 9. Béryllium. Beryllium is also used in specialty alloys. Available for both RF and RM licensing. 1. Wohler and A. In addition, it is situated in period two, between lithium and boron. com. B Thus beryllium has an [He] s2 electron configuration. Click on above elements in the periodic table to see their information. Compare elements on more than 90 properties. 1) (2. Used in aerospace and in particle detectors. The oxide has a very high melting point and is also used in nuclear work and ceramic applications. Beryllium element is in group 2 and period 2 of the Periodic table. It is represented by the symbol Be and has an atomic number of 4. Please let us know how we can Find the perfect beryllium chemical element periodic table stock photo, image, vector, illustration or 360 image. Beryllium is a chemical element with atomic number 4 which means there are 4 protons in its nucleus. 2: Lewis Electron Dot Diagrams is shared under a CC BY-NC-SA 3. Beryllium 4 lithium ← beryllium → boron -↑Be↓Mg Periodic table - Extended periodic table General Name, symbol, number beryllium, Be, 4 Chemical seriesalkaline Jun 26, 2023 · The periodic table (see figure below) displays all of the known elements and is arranged in order of increasing atomic number. X-rays readily penetrate materials of low atomic number, and beryllium metal has the best mechanical properties for the production of such windows. Each element is identified by the number of protons in its atoms. Let us discuss each of these in detail one by one. Beryllium is used in nuclear as neutron moderators and reflectors. It is a metal and has a high melting point. 0026; 2. Physical Characteristics. It is the first member of alkaline earth metals with a very small size and very high effecting nuclear charge. 29), we also see a periodic recurrence of similar electron Flickr Creative Commons Images. Compare Beryllium vs Strontium of the Periodic Table on all their Facts, Electronic Configuration, Chemical, Physical, Atomic properties. 4. 2. Key groups include alkali metals, alkaline earth metals, halogens Color: steel gray. Its compounds are sweet tasting but are very toxic. 3 Dmitri Mendeleev and the development of the periodic table 2. The term "halogen" means "salt-former" and compounds that contain one of the halogens are salts. It is used for making windows for x-ray tubes and radiation counters. Applications. The chemical symbol for Barium is Ba. 72. Find physical data, electron configuration, chemical properties, aggregation states, isotope data (including decay trees) as well as some historic information. Learn how to determine the number of valence electrons for an element using the periodic table. Shows high covalent character. Click to see the original works with their full license. Beryllium is a lightweight metal that possesses unique properties, making it an important element in various applications. 5. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. . The most important compounds of boron are boric (or boracic) acid, borax (sodium borate) and boric oxide. 6. It has an atomic mass of 9. The number of valence electrons determines most of an atom's chemical behaviors. Beryllium. 0121823 amu. Beryllium forms an oxide layer making it not react with air or water even in extreme heat. All the elements of similar categories show a lot of similarities and differences in their chemical, atomic, physical properties and uses. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. It is also nonmagnetic and has a very high thermal conductivity. The charge on an atom is related to its valence electrons or oxidation state . Beryllium was discovered by French chemist Louis-Nicolas Vauquelin (1763-1829) in 1798. It does not exist freely in its elemental form in nature. An element of group 13 of the periodic table. 630. Beryllium is a silver-grey metal and is hard and brittle at room temperature. Hardness: 5. Boron. Solution: A The group 2 elements are in the s block of the periodic table, and as group 2 elements, they all have two valence electrons. Beryllium is used in nuclear reactors as a reflector or moderator for it has a low thermal neutron absorption cross section. Beryllium is a chemical element of the periodic table with chemical symbol Be and atomic number 4 with an atomic weight of 9. A modern version is shown in Figure 2. These dots are arranged to the right and left and above and below the symbol, with no more than two dots on a side. Beryllium is solid at room temperature. ) For example, the electron-dot symbol for hydrogen is simply. 0 license and was authored, remixed, and/or curated by The periodic table is one of the cornerstones of chemistry because it organizes all the known elements on the basis of their chemical properties. Our Periodic Element comparison tool allows you to compare Periodic Elements properties side by side for all 118 elements | SchoolMyKids Interactive Dynamic Periodic Table of elements Barium. Beryllium is the 4th element in the periodic table and has a symbol of Be and atomic number of 4. In its free state beryllium is a strong, but brittle metal. Hydrogen, at the upper left of the table, has an atomic number of 1. With a small atomic radius, Be 2 + has high polarization characteristics allowing it to form many covalent bonds. 01218 and a mass number of 9. The table is divided into metals, nonmetals, and metalloids, each with distinct properties. It is used in gyroscopes, computer parts, and instruments where lightness, stiffness, and dimensional stability are required. 0122 u. Helium was detected in the sun by its spectral lines many years before it was found on Earth. When their electron configurations are added to the table (Figure 6. As described earlier, the periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. So it is stored by being coated with petroleum jelly. The periodic table is a chart that shows how the chemical elements are related to each other. Elements in the same group share similar characteristics, like reactivity. 0121831: Density: 1. 85 × 10 -6 m 3 /mol. Beryllium is a chemical element with the symbol Be and atomic number 4. For example, krypton will react with fluorine to form krypton fluoride. Each element has a symbol, which is one or two letters. Beryllium is a chemical element with symbol Be and atomic number 4. A short film about the chemistry of Beryllium, presented by The Periodic Table of Videos. It is also used in some flash lamps used for high-speed photography. May 28, 2024 · Each of the elements found in this column, which are boxed in lavender in Figure 2. Its boiling point is the lowest among all the elements. Halogens are comprised of the five nonmetal elements Flourine, Chlorine, Bromine, Iodine, and Astatine. There are 118 elements on the periodic table. , the total number of protons in the atomic nucleus. Beryllium is the 4th element of the periodic table so its atomic number is 4. 01218 u and is classed as alkaline earth metal and is part of group 2 (alkaline earth metal). Learn about the chemical and physical properties, uses, sources, and history of beryllium, an alkaline-earth metal with symbol Be and atomic number 4. Lithium is a soft, silvery-white, metal that heads group 1, the alkali metals group, of the periodic table of the elements. This page titled 9. Vauquelin suggested the name glucinium, meaning "sweet tasting," for the element because the element and some of its compounds have a sweet taste. Please note that the chemical formula is not limited to the known chemical compounds. . Storing it is a problem. 32. Beryllium is a relatively rare element in the universe and not a metal most people have seen in pure form. 1, reacts readily with metals to form compounds that can be broadly classified as salts and, therefore, are known as the halogens, which is derived from a combination of Greek words that translate to "salt makers. The atomic number of each element increases by one, reading from left to right. When the chemical elements are thus arranged, there is a recurring pattern called the “periodic law” in their properties, in which elements in the same column (group Beryllium is a Group 2 (IIA) element. 7 Atomic Mass, Isotopes, and Allotropes Beryllium on periodic table of the elements, with element symbol Be Beryllium on periodic table of the elements. Jun 8, 2024 · Beryllium is a classified brittle alkaline earth metal and its symbol is ‘Be’. It is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Oxidation state: 2. 2 2. Beryllium’s Position in the Reactivity Series Beryllium is a light, silvery-white metal. Besides that, it has 9 synthetic, radioactive Atomic Volume. 8. The S-block includes groups 1 and 2 of the periodic table, which are called the alkali metals and alkaline-earth metals Compare Beryllium vs Lithium of the Periodic Table on all their Facts, Electronic Configuration, Chemical, Physical, Atomic properties. Beryllium is a chemical element that can be found in the periodic table. 11. It is found in the composition of some noble gemstones, including chrysoberyl and beryl. It is silver-gray metallic in color. Our Periodic Element comparison tool allows you to compare Periodic Elements properties side by side for all 118 elements | SchoolMyKids Interactive Dynamic Periodic Table of elements Uses. Get the facts about element Beryllium (Be) [4] from the periodic table. The elements are arranged in horizontal rows called periods and vertical columns called groups. A. It is a relatively rare element in the universe 4. 116LvLivermorium (293) 117TsTennessine (294) 118OgOganesson (294) For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses. This number is the atomic number. Find out how beryllium is related to x-rays, neutrons, and emeralds. 4 Families of the Periodic Table 2. 2. Jun 17, 2023 · Beryllium element in Periodic table. In the chlorine model below, the valence electrons are shown in red . It is a steel-grey metal resistant to attack by concentrated nitric acid. The modern periodic table of elements arranges the elements according to the increasing order of the atomic number starting from atomic number 1 for H and ending with atomic number 118 for Og, as shown in Fig. Oct 27, 2022 · A modern periodic table arranges the elements in increasing order of their atomic numbers and groups atoms with similar properties in the same vertical column (Figure 2. 5. 2 Introduction to Elements and the Periodic Table 2. Common Compounds. It was isolated independently by F. 012 and atomic number of 4. Electron Configurations and the Periodic Table. En somme, la table périodique des éléments chimiques est un outil inestimable pour les étudiants et les scientifiques. Learn more about elements on the periodic table. A naturally occurring element, Beryllium is the fourth element on the Periodic Table with the symbol "Be". 3 Li Lithium 6. 4. Beryllium exists in 30 different minerals, among which bertrandite, beryl, chrysoberyl, and phenacite are the most important. 85 g/cm 3 at room temperature. When bombarded with alpha particles (helium nuclei), the resulting reaction can produce a high yield of neutrons. The elements are arranged in seven horizontal rows Beryllium metal. 3. H⋅ (2. It has an atomic weight of 9. Sep 15, 2022 · The periodic table is one of the cornerstones of chemistry because it organizes all of the known elements on the basis of their chemical properties. This periodic table is created by Dr Kaisa Helttunen and Heikki Beryllium copper is an alloy of copper often used for tools that need to be reasonably strong and reasonably hard, but that more importantly need to not create sparks when used. Hydrogen, Helium, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Phosphorous, Sulphur, Chlorine, and Argon are the non-metals in the first twenty elements. Beryllium (symbol Be), the fourth element in the periodic table Antoine2K/Shutterstock. 85 Periodic Table of Elements Atomic Symbol Name Weight. beryllium periodic table stock illustrations Nov 21, 2020 · Berkelium is a chemical element with atomic number 97 which means there are 97 protons and 97 electrons in the atomic structure. Each box represents an element and contains its atomic number, symbol, average atomic mass, and (sometimes) name. It is stronger than steel but is the lightest metal. It is the first alkaline earth metal, located at the top of the second column or group of the periodic table. Its ability to scratch glass is probably due to the formation of a thin layer of the oxide. Beryllium is in solid state at STP and it is classified as an alkaline earth metal on the periodic table. The periodic table is used as a predictive tool that arranges of the elements in order of Jan 31, 2024 · The periodic table (see figure below) displays all of the known elements and is arranged in order of increasing atomic number. The periodic table is used as a predictive tool that arranges of the Nov 21, 2020 · Atomic mass of Beryllium is 9. Atomic number (number of protons in the nucleus): 4; Atomic symbol (on the Periodic Table of the Elements): Be; Atomic weight (average mass of the atom): 9. However, other charges are possible. Found in beryl gemstones. Gemstones high in beryllium include beryl (aquamarine, emerald, red beryl) and chrysoberyl. The chemical symbol for Beryllium is Be. Aug 11, 2023 · Beryllium in Periodic table. Beryllium is used as a target for neutron production. The most common minerals of barium are barite ( barium sulfate Other important groupings of elements in the periodic table are the main group elements, the transition metals, the lanthanides, and the actinides. Beryllium is naturally present in minerals such as beryl and emerald, which have been recognized since ancient times by the Egyptians. body-centered cubic (bcc) ( cI2) Barium is a chemical element; it has symbol Ba and atomic number 56. Informations sur l'élément Mar 18, 2024 · The first ten elements in the periodic table are as follows: Hydrogen (H), Helium (He), Lithium (Li), Beryllium (Be), Boron (B), Carbon (C), Nitrogen (N), Oxygen (O), Fluorine (F), Neon (Ne). What is Beryllium. It is a brittle, steel-gray solid at room temperature. Krypton is used commercially as a filling gas for energy-saving fluorescent lights. These can be found in eye drops, mild antiseptics, washing powders and tile glazes. Beryllium has four protons and five neutrons in its nucleus, and four electrons in two shells. Characteristics: Beryllium has the highest melting point of the light metals, melting at 1278 °C - considerably higher than, for example, Lithium (180 °C) Sodium (98 °C) Magnesium (650 °C) Aluminum (660 °C) or Calcium (839 °C). Be stable and long lived isotopes are 9 Be: 100%. A colourless, odourless gas that is totally unreactive. 9 cm 3 /mol. A modern version is shown in Figure 4. The ratio of the average mass per atom of an isotope to 1/12 the mass of a carbon-12 atom. Common Uses. Relative atomic mass is also known as atomic weight (symbol: A r ). The atomic mass is the mass of an atom. Relative atomic mass: 9. Shell structure: 2,2. Dec 30, 2019 · Beryllium (Be) is a light silver-gray metal that has the atomic number 4 in the periodic table. Is toxic and can cause severe lung diseases and dermatitis. This is important if you are, for example, working on an oil well and are drenched in flammable fluid while using the tool. Beryllium compounds are very toxic. Crystal structure: hexagonal. Lewis electron dot diagrams for ions have less (for cations) or more (for anions) dots than the corresponding atom. Unlike the lighter gases in its group, it is reactive enough to form some chemical compounds. The atomic mass is carried by the atomic nucleus, which occupies only about 10 -12 of the total volume of the atom or Use this visual tool for calculating molar mass for any chemical formula. Compare . 1. Interactive periodic table showing names, electrons, and oxidation states. Neutrons: 5. Lithium Periodic table Boron. It is an Alkaline earth metal with the symbol Be that belongs in Group 2 of the periodic table. An atom's valence electrons are the electrons in its outermost shell. Options for hiding the symbol or name of the elements provide a handy learning aid for memorizing the periodic table. Beryllium belongs to the Group 2 (IIA) of periodic tables which makes it one of the alkaline earth Beryllium is a chemical element; it has symbol Be and atomic number 4. Oxidation States. Beryllium is an element with an atomic number of 4 in the periodic table. Rare alkaline earth metal, and chemical element with Symbol Be, and atomic number 4. Its modulus of elasticity (a measure of its Atomic radius / pm: 111. The sum of the number of protons and neutrons of an atomic nucleus. Naturally occurring Be has a single stable isotope with mass number 9 [1]. 008; 2 He Helium 4. Beryllium and Boron on the basis of their properties, attributes and periodic table facts. Extra videos -- Our YouTube Channel -- Sixty Symbols (physics) -- Numberphile (maths) -- Facebook -- Twitter -- Email Dec 2, 2019 · Beryllium is the element that is atomic number 4 on the periodic table. It is a relatively rare element in the universe, usually occurring as a product of the The periodic table organizes elements into groups and periods based on their chemical and physical properties. Aquamarine and emerald are precious forms of the mineral beryl, [Be 3 Al 2 Jun 27, 2022 · Lewis electron dot diagrams use dots to represent valence electrons around an atomic symbol. Beryllium (atomic number 4, symbol Be) is a divalent chemical metal which occurs in nature in a combination with different minerals and metals. It transmits x-rays 17 times faster than aluminum. Beryllium is widely used to alloy with other metals such as copper and is used in springs and electrical equipment due to its non magnetic nature. 1, 2. It is used largely in metallurgy to improve the properties of copper and nickel alloys. IUPAC Periodic Table of the Elements and Isotopes (IPTEI) 9. Oct 7, 2017 · Just the facts. Nov 21, 2023 · Barium is found in a section of the periodic table called the S-block. Nov 21, 2020 · Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Beryllium was once known as glucinium, from the Greek word meaning sweet, thanks to the sweet tastes of its salts. Glossary. e. 2 Isotope Mass and Abundance. Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal. Beryllium is very lightweight, but has one of the highest melting points of all the light metal elements. Beryllium is used in nuclear reactors as a reflector or moderator. Nov 21, 2018 · As a lightweight, super-strong metal, beryllium is an engineer’s dream – but it also has some less convenient qualities. Among the light metals, beryllium has one of the highest melting points. 012182; Density: 1. The Beryllium element (Be) has the atomic number 4 and is located in group 2 and period 2. 69 K: 1560 K: Boiling Point: 1615 K: 2743 2. Fully descriptive writeups. May 2, 2024 · periodic table, in chemistry, the organized array of all the chemical elements in order of increasing atomic number —i. Jun 30, 2023 · Like all elements in the 2nd group on the periodic table, beryllium has +2 oxidation state. Grey metallic element of group 2 of the periodic table. Beryllium and Boron. It is a low-density metal and have a density of around 1. 0122; 5 B Boron 10. Most periodic tables provide additional data (such as atomic mass) in a box that contains each element’s symbol. Nov 21, 2020 · Barium is a chemical element with atomic number 56 which means there are 56 protons and 56 electrons in the atomic structure. Beryllium fluoride (BeF 2) Interesting facts. You can use this table to predict whether an atom can bond with another atom. 6 Atomic Number – Protons Determine the Identity of an Element 2. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. In a free state, beryllium is a lightweight, strong, brittle, and steel-grey, alkaline earth metal. It is a bivalent and highly toxic element. 81; 6 C May 19, 2015 · Beryllium foil is used as the window for x-ray emitters. They are located on group 17 of the periodic table and have a charge of -1. 1 H Hydrogen 1. Beryllium is a chemical element; it has symbol Be and atomic number 4. The periodic table lists the elements in order of increasing atomic number. Molar volume: 4. Gemstones high in beryllium include beryl and chrysoberyl. Thermal Conductivity. The most common charges are based on maximum stability for the atom. (It does not matter what order the positions are used. 5: The Periodic Table is shared under a license and was authored, remixed, and/or curated by LibreTexts. It does not corrode (rust). The elements are listed in order of Germanium. Elle fournit une vision complète des éléments chimiques et de leurs propriétés et peut être facilement utilisée pour explorer et apprendre à propos des éléments chimiques. Its symbol is Be. 1) H ⋅. 0122 State: gas Group, period, block: 2, 2, s Color: white-gray metallic Classification: alkaline earth metal Electron configuration: 1s2 2s2. PeriodA horizontal row in the periodic table. Harmful effects: Beryllium and its salts are both toxic and carcinogenic. Beryllium is one-third lighter than aluminum, yet has six times the specific stiffness of steel. Therefore, a beryllium atom has four protons and four electrons. 94; 4 Be Beryllium 9. Explore how density changes with atomic number in the periodic table of elements via interactive plots. A modern version is shown in Figure 1. The chemical symbol for Helium is He. In this periodic table, an element's atomic number is indicated above the elemental symbol. Dec 10, 2023 · Other important groupings of elements in the periodic table are the main group elements, the transition metals, the lanthanides, and the actinides. 01 W/cm·K. Beginning with beryllium, we see that its nearest preceding noble gas is helium and that the principal quantum number of its valence shell is n = 2. Beryllium is the s-block element and it belongs to alkaline earth metals group. 6: The Periodic Table of the Elements is shared under a license and was authored, remixed, and/or curated by LibreTexts. Beryllium atomic weight is 9. In this table, an element's atomic number is indicated above the elemental symbol. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. It reacts vigorously with water. May 7, 2024 · This table shows the most common charges for atoms of the chemical elements. 5 Defining the Atom Basic Atomic Structure – electrons, neutrons, and protons 2. 2 ). Hydrogen (H) Hydrogen is the first element in the periodic table with atomic number 1 and symbol H. The nucleus is composed of protons and neutrons. It is a steel-gray, strong, lightweight and brittle alkaline earth metal. Group in Periodic Table: group : 1 group : 2 Group Name: lithium family: beryllium family: Period in Periodic Table: period : 2 period : 2 Block in Periodic Table: s -blocks -blockElectronic Configuration [He] 2s1 [He] 2s2 : Electronic Shell Structure (Electrons per shell) 2, 1: 2, 2: Melting Point: 453. Apr 17, 2023 · The periodic table is one of the cornerstones of chemistry because it organizes all of the known elements on the basis of their chemical properties. Name: Beryllium Symbol: Be Atomic number: 4 Atomic weight: 9. Bussy in 1828. Our Periodic Element comparison tool allows you to compare Periodic Elements properties side by side for all 118 elements | SchoolMyKids Interactive Dynamic Periodic Table of elements Jan 15, 2024 · The number of dots equals the number of valence electrons in the atom. Protons/Electrons: 4. Beryllium (pronunciation beh-RIL-ee-em [2] ), represented by the chemical symbol or formula Be [1], is a light-weight, high-strength element belonging to the family of alkali earth metals [3, 15, 41]. Visualize trends, 3D orbitals, isotopes, and mix compounds. Electron configuration: [He]2s2. 012 1831 (5) Beryllium was discovered by Louis-Nicholas Vauquelin (FR) in 1798. Compare Beryllium vs Sodium of the Periodic Table on all their Facts, Electronic Configuration, Chemical, Physical, Atomic properties. 5 mohs. At ordinary temperatures, beryllium resists oxidation in air. Beryllium metal is used for lightweight structural components in the defense and aerospace industries in high-speed aircraft, guided missiles, space vehicles and satellites. Members of a group typically have similar properties and electron configurations in their outer shell. The element has one of the highest melting points among the light metals. Jun 30, 2023 · Halogens. Because of its high chemical reactivity, barium is never found in nature as a free element. Beryllium electronic configuration is 1s 2 2s 2. Beryllium is an element number 4 from alkali earth metals family. Some images used in this set are licensed under the Creative Commons through Flickr. Mar 21, 2022 · A modern periodic table arranges the elements in increasing order of their atomic numbers and groups atoms with similar properties in the same vertical column (Figure 2. 1 4. In other words, it's the sum of the number of nucleons in an atom. Click on above elements (in Periodic table) to see their information. It gives the flares a distinctive green colour. The element beryllium is perhaps one of the strangest in the periodic table. The name beryllium was adopted officially in 1957. Appearance. GroupA vertical column in the periodic table. 1 2. Uses. Most periodic tables provide additional data (such as atomic weight) in a box that contains each element’s symbol. 1 1. 848 g/cm 3: Melting Point: Click here to buy a book, photographic periodic table Jun 3, 2023 · Beryllium exhibits a steel-gray colour and possesses brittleness at room temperature, sharing certain chemical characteristics with aluminum. Helium is used as a cooling medium for the Large Hadron Collider (LHC), and the superconducting magnets in MRI scanners and NMR spectrometers. com . 2 ). About 2% of beryllium in copper produces What are the metal (s) and non-metals in the first 20 elements? Lithium, Beryllium, Sodium, Magnesium, Aluminium, Potassium, and Calcium are metals in the first twenty elements. The atomic number of an element is equal to the number of protons and electrons in that element. The chemical symbol for Berkelium is Bk. Amorphous boron is used as a rocket fuel igniter and in pyrotechnic flares. May 12, 2024 · The periodic table is one of the cornerstones of chemistry because it organizes all the known elements on the basis of their chemical properties. Apr 17, 2022 · Beryllium in the Periodic Table. It cannot be kept under oil, as sodium can, because it is less dense and floats. The origin of the name comes from the Greek word beryllos meaning mineral beryl; also called glucinium from the Greek word glykys meaning sweet. Beryllium is considered a carcinogen, meaning that it can cause cancer in humans. It is a divalent element that occurs naturally only in combination with other elements to form minerals. Beryllium (Be) has an atomic mass of 4. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. It can be found in urine and blood. Microsoft Teams. Beryllium is a chemical element or alkaline-earth metal of Group 2 (IIA) of the periodic table with the symbol Be and atomic number 4. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Sample compounds that contain Beryllium are BeSO4, BeCl2, Be2SO4, Be (CH3COO)2, BeI2, BeO. je nl os mu my ua ws kx bb ye