Lawrencium

Actinide · 266.120 u · group 3, period 7

Lawrencium · Lr

Atomic number103

SymbolLr

CategoryActinide

Standard stateSolid

Group · Period · Block3 · 7 · f

Electron configuration[Rn]7s2 5f14 6d1

Atomic mass266.120 u

Atomic radius—

Protons / Neutrons / Electrons103 / 163 / 103

Shells (e⁻ per shell)2, 8, 18, 32, 32, 9, 2

Electronegativity (Pauling)1.3

Ionization energy—

Electron affinity—

Oxidation states+3

Melting point1.90e+3 K · 1.63e+3 °C

Boiling point—

Density—

Year discovered1961

CPK color

#C70066

State at room temp (25 °C)

solid

Position