Einsteinium

Actinide · 252.0830 u · group 3, period 7

Einsteinium · Es

Atomic number99

SymbolEs

CategoryActinide

Standard stateSolid

Group · Period · Block3 · 7 · f

Electron configuration[Rn]7s2 5f11

Atomic mass252.0830 u

Atomic radius245 pm

Protons / Neutrons / Electrons99 / 153 / 99

Shells (e⁻ per shell)2, 8, 18, 32, 29, 8, 2

Electronegativity (Pauling)1.3

Ionization energy6.42 eV

Electron affinity—

Oxidation states+3

Melting point1.13e+3 K · 859.9 °C

Boiling point—

Density—

Year discovered1952

CPK color

#B31FD4

State at room temp (25 °C)

solid

Position