102 No

Nobelium

Actinide
Atomic number102
CategoryActinide
Atomic mass259
Electron configuration[Rn]5f¹⁴ 7s²
Oxidation states+2, +3
Electronegativity1.3
Melting point827 °C
Crystal structureUnknown
Period7
Blockf
Discovered1,966
Crustal abundance0 ppm

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