Stable isotope Beryllium (Be)

Isotope Z(p) N(n) Atomic Mass Natural Abundance Nuclear Spin
Be-9 4 5 9.0121822 100.00% 3/2-

Properties of Beryllium

Name Beryllium
Symbol Be
Atomic number 4
Atomic weight 9.01218
Standard state Solid at 298 °K
CAS Registry ID 7440-41-7
Group in periodic table 2
Group name Alkaline earth metal
Period in periodic table 2
Block in periodic table s-block
Color Gray-white or lead gray
Classification Metallic
Melting point 1287 °C
Boiling point 2970 °C
Thermal conductivity 190 W/(m·K)
Electrical resistivity 3.36 x 10-10 µΩ·cm at 20 °C
Electronegativity 1.5
Specific heat 1820 J/(kg·K)
Heat of vaporization 297 kJ·mol-1
Heat of fusion 7.95 kJ·mol-1
Density of solid 1.85 g/cm3
Electron configuration [He]2s2
Oxidation state 2+
Atomic radius 1.06 Å
Ionic radius Be2+ : 0.30 Å