Properties of the Elements
Beryllium
Chemical Symbol  Be 
Atomic Number  4 
Electron Configuration  1s2 2s2
Stable Phase at 298.15 K  hexagonal close packed 
Density (298 K)
1.82 g/cc
Atomic Mass  9.0122 
Young's Modulus, GPa
318 
Melting Temperature, K
1560