Einsteinium

Actinide

Symbol: Es

Atomic Number: 99

Standard State: Solid

Atomic Mass: 252.083

Electron Configuration: [Rn]7s2 5f11

Electronegativity: 1.3

Atomic Radius: 245

Ionization Energy: 6.42

Melting Point: 1133

Boiling Point:

Density:

Year Discovered: 1952