Nobelium

Actinide · 259.10100 u · group 3, period 7

Nobelium · No

Atomic number102

SymbolNo

CategoryActinide

Standard stateSolid

Group · Period · Block3 · 7 · f

Electron configuration[Rn]7s2 5f14

Atomic mass259.10100 u

Atomic radius—

Protons / Neutrons / Electrons102 / 157 / 102

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

Electronegativity (Pauling)1.3

Ionization energy6.65 eV

Electron affinity—

Oxidation states+3, +2

Melting point1.10e+3 K · 826.9 °C

Boiling point—

Density—

Year discovered1957

CPK color

#BD0D87

State at room temp (25 °C)

solid

Position