Beryllium, chemical element that is the lightest member of the alkaline-earth metals of Group 2 of 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 atomic number is 4 and the symbol is Be. Atomic Number – Protons, Electrons and Neutrons in Beryllium. Be has two electrons in its outermost orbital and its combining capacity or valency is two. The chemical symbol for Beryllium is Be.. Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust. Beryllium is a silver-grey metal and is hard and brittle at room temperature. Atomic mass of Beryllium is 9.0122 u. Beryllium was to play a historic role in advancing our knowledge of atomic theory since it helped uncover the fundamental particle, the neutron. Be is a divalent element which occurs naturally only in combination with other elements in minerals. It is a low-density metal and have a density of around 1.85 g/cm 3 at room temperature. Chem. 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. Atomic structure of Beryllium includes atomic number, atomic weight, electron configuration 2003 (75) 683-800 Pure Appl. Beryllium is a chemical element with symbol Be and atomic number 4. 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. It is used in metallurgy as a hardening agent and in many outer space and nuclear applications. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Beryllium belongs to the Group 2 (IIA) of periodic … Which comparison is best supported by this information? It is an Alkaline earth metal with the symbol Be that belongs in Group 2 of the periodic table. Beryllium metal was isolated in 1828 from beryllium chloride (BeCl 2) by reacting this with potassium. It is a steel-gray metal that is quite brittle at room temperature. It has an atomic mass of 9.012 and atomic number of 4. Atomic Number of Beryllium. Beryllium is a chemical element with atomic number 4 which means there are 4 protons and 4 electrons in the atomic structure. Classified as an alkaline earth metal, Beryllium is a solid 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). Be has 12 known isotopes, but only one of these isotopes (9Be) is stable and a primordial nuclide. 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