Symbol Es Atomic radius: pm - Fusion: kJ/Mole -
Name Einsteinium Ionic radius: pm - Boiling point: C -
Atomic number 99 Electron affinity - Melting point: C 860
Atomic weight 252.0 1st  ion potential 6.42 Specific Heat Cap: J/(g K) -
Classification Trans metal Natural form Solid Thermal Cond: W/(cm K) -
Configuration [Rn]5f117s2 Crystal structure Hex Electrical Cond -
Oxidation states 3 Density - Abundance: mg/kg-crust Synthetic
Electronegativity - Vaporization: kJ/Mole 133.0    
Einsteinium does not occur in nature, but it was produced in 1952 by Albert Ghiorso and co-workers at Berkeley,California in debris taken from the first thermonuclear or hydrogen bomb explosion in the South Pacific in November of 1952. Uses -  no known uses