Beryllium is the only monoisotopic element with an even atomic number, but it has an odd mass number like all other monoisotopic elements. The chemical symbol for Beryllium is Be.. Atomic Mass of Beryllium. Beryllium is a chemical element with symbol Be and atomic number 4. Pure Appl. It is an Alkaline earth metal with the symbol Be that belongs in Group 2 of the periodic table. Be has two electrons in its outermost orbital and its combining capacity or valency is two. Be is a divalent element which occurs naturally only in combination with other elements in minerals. Classified as an alkaline earth metal, Beryllium is a solid at room temperature. 2003 (75) 683-800 Beryllium belongs to the Group 2 (IIA) of periodic … Chem. SOURCE Atomic weights of the elements: Review 2000 by John R de Laeter et al. The elements have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure.. Atomic structure of Beryllium includes atomic number, atomic weight, electron configuration It is a low-density metal and have a density of around 1.85 g/cm 3 at room temperature. 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 a silver-grey metal and is hard and brittle at room temperature. 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). Atomic mass of Beryllium is 9.0122 u. Which comparison is best supported by this information? Beryllium metal was isolated in 1828 from beryllium chloride (BeCl 2) by reacting this with potassium. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. The atomic number of beryllium (Be) is 4, and the atomic number of barium (Ba) is 56. Beryllium atomic number is 4 and the symbol is Be. 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. Beryllium (Be) is a light silver-gray metal that has the atomic number 4 in the periodic table. A: They are in the same group because they have similar atomic masses, but they are in different periods because they have different chemical properties. 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 steel-gray metal that is quite brittle at room temperature. 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