Iron

Transition metals · Group 8 · Period 4

Atomic properties

Atomic number	26
Symbol	Fe
Standard atomic weight	55.845
Classification	Transition metals
Group	8
Period	4
Block	d-block
Electron configuration	[Ar] 3d6 4s2
Electronegativity (Pauling)	1.83
Common oxidation states	+3, +2

Physical properties

Phase at 20 °C	Solid
Density	7.874 g/cm³
Melting point	1538 °C
Boiling point	2861 °C
Discovered	Ancient
CAS number	—

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