Beryllium (Be) is a light silver-gray metal that has the atomic number 4 in the periodic table. 2003 (75) 683-800 The alkaline earth metals are six chemical elements in group 2 of the periodic table.They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). Chem. Beryllium is a chemical element with symbol Be and atomic number 4. Beryllium is a silver-grey metal and is hard and brittle at room temperature. Atomic Number – Protons, Electrons and Neutrons in Beryllium. It is a steel-gray metal that is quite brittle at room temperature. Beryllium is a chemical element with atomic number 4 which means there are 4 protons in its nucleus.Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z.The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. Atomic mass of Beryllium is 9.0122 u. Beryllium is the only monoisotopic element with an even atomic number, but it has an odd mass number like all other monoisotopic elements. The atomic number of beryllium (Be) is 4, and the atomic number of barium (Ba) is 56. Classified as an alkaline earth metal, Beryllium is a solid at room temperature. Be has 12 known isotopes, but only one of these isotopes (9Be) is stable and a primordial nuclide. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Beryllium metal was isolated in 1828 from beryllium chloride (BeCl 2) by reacting this with potassium. Be is a divalent element which occurs naturally only in combination with other elements in minerals. It has an atomic mass of 9.012 and atomic number of 4. Beryllium was to play a historic role in advancing our knowledge of atomic theory since it helped uncover the fundamental particle, the neutron. 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. The chemical symbol for Beryllium is Be.. Atomic Mass of Beryllium. SOURCE Atomic weights of the elements: Review 2000 by John R de Laeter et al. It is an Alkaline earth metal with the symbol Be that belongs in Group 2 of the periodic table. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. It is a low-density metal and have a density of around 1.85 g/cm 3 at room temperature. Atomic Number of Beryllium. Pure Appl. Which comparison is best supported by this information? The elements have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure.. Beryllium, chemical element that is the lightest member of the alkaline-earth metals of Group 2 of the periodic table. 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