Atomic Number 4     Atomic Mass 9.0121822     Density 1.85 g/mL

Natural Isotope Be-9 100%    State solid    Color lead grey    

Electronegativity 1.57     Melting Point 1278°C     Boiling Point 2970°C

Abbreviated Electron Configuration [He] 2s²

Discovered by N. Vauquelin in 1797.