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Lawrencium (eka-lutetium) 103 General Name, Symbol, Number: lawrencium, Lr, 103 Chemical series: actinides Group, Period, Block: n/a, 7, d Appearance: unknown, probably silvery, white or metallic gray Atomic mass: (262) g/mol Electron configuration: probably [Rn] 5f14 7s2 7p1 Electrons per shell: 2, 8, 18, 32, 32, 8, 3 Phase: presumably a solid Melting point: 1900 K (1627 °C, 2961 °F) Ionization energies: 1st 470 kJ/mol CAS registry number: 22537-19-5 (From Wikipedia)