1.85g/cm3
Berylium is a non metal element. Atomic mass of it is 9.
Berylium is a metal element. There are 4 electrons in a single atom.
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Berylium
Beryllium is an element. It is not a compound
Atomic mass is roughly the amount of protons and neutrons in an element. Berylium has 4 protons and 5 neutrons giving it an atomic mass of about 9. (9.012182 amu)