Beryllium

Koushik 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08

Property	Value
Atomic Number	4
Element	Beryllium
Symbol	Be
Atomic Mass	9.0122 u
Number of Neutrons	5 (most common isotope, Beryllium-9)
Number of Protons	4
Number of Electrons	4
Period	2
Group	2
Phase	Solid
Radioactive	No
Natural	Yes
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Alkaline Earth Metal
Atomic Radius	112 pm
Electronegativity	1.57 (Pauling scale)
First Ionization Energy	9.323 eV
Density	1.85 g/cm³
Melting Point	1287 °C
Boiling Point	2469 °C
Number of Isotopes	12 (only Be-9 is stable)
Discoverer	Louis Nicolas Vauquelin
Year	1798
Specific Heat	1.825 J/g·K
Number of Shells	2
Number of Valence Electrons	2