99
252 u
Es
Einsteinium
Actinide
Atomic Structure
Physical State
Group
N/A
Period
7
Block
f
Electron Configuration
[Rn] 5f¹¹ 7s²
Physical Properties
Atomic Mass:
252 u
Electronegativity:
1.3
Atomic Radius:
186 pm
Ionization Energy:
6.42 eV
Density:
8.84 g/cm³
Melting Point:
1133 K
Boiling Point:
1269 K
Historical Information
Discovered By:
Lawrence Berkeley National Laboratory
Year Discovered:
1952