103Lr

Lawrencium

Actinide

Lawrencium (Lr) is element 103, an actinide, in period 7 and group 3 of the periodic table. Its atomic mass is usually given as 266, it melts at 1627 °C. Discovered by Lawrence Berkeley Lab, 1961.

Atomic Number103

SymbolLr

NameLawrencium

Atomic Weight266 u

CategoryActinide

Period7

Group3

Melting Point1627 °C

Electron Config[Rn] 5f14 7s2 7p1

Discovered ByLawrence Berkeley Lab, 1961

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