Iron

Transition metal · 55.84 u · group 8, period 4

Iron · Fe

Atomic number26

SymbolFe

CategoryTransition metal

Standard stateSolid

Group · Period · Block8 · 4 · d

Electron configuration[Ar]4s2 3d6

Atomic mass55.84 u

Atomic radius194 pm

Protons / Neutrons / Electrons26 / 30 / 26

Shells (e⁻ per shell)2, 8, 14, 2

Electronegativity (Pauling)1.83

Ionization energy7.902 eV

Electron affinity0.163 eV

Oxidation states+3, +2

Melting point1.81e+3 K · 1.54e+3 °C

Boiling point3.13e+3 K · 2.86e+3 °C

Density7.874 g/cm³

Year discoveredAncient

CPK color

#E06633

State at room temp (25 °C)

solid

Position

2 in library