Sodium

Alkali metal · 22.9897693 u · group 1, period 3

Sodium · Na

Atomic number11

SymbolNa

CategoryAlkali metal

Standard stateSolid

Group · Period · Block1 · 3 · s

Electron configuration[Ne]3s1

Atomic mass22.9897693 u

Atomic radius227 pm

Protons / Neutrons / Electrons11 / 12 / 11

Shells (e⁻ per shell)2, 8, 1

Electronegativity (Pauling)0.93

Ionization energy5.139 eV

Electron affinity0.548 eV

Oxidation states+1

Melting point370.9 K · 97.8 °C

Boiling point1.16e+3 K · 882.9 °C

Density0.97 g/cm³

Year discovered1807

CPK color

#AB5CF2

State at room temp (25 °C)

solid

Position

2 in library

C₃₂H₂₂N₆Na₂O₆S₂