Symbol Be Atomic radius: pm 111 Fusion: kJ/Mole 7.9
Name Beryllium Ionic radius: pm (+2)45 Boiling point: C 2471
Atomic number 4 Electron affinity Unstable anion Melting point: C 1287
Atomic weight 9.010 1st  ion potential 9.32 Specific Heat Cap: J/(g K) 1.83
Classification Alk earth metal Natural form Solid Thermal Cond: W/(cm K) 2.00
Configuration 1s22s2 Crystal structure Hex Electrical Cond 0.313
Oxidation states 2 Density 1.85 Abundance: mg/kg-crust 2.8
Electronegativity 1.57 Vaporization: kJ/Mole 308.8    
Beryllium was discovered in 1798 by Fredrich Wohler.   Uses - x-ray windows, ceramics, spacecraft, missles, aircraft, copper alloys