Transition metal

Iron

Iron (Fe) has atomic number 26. PubChem classifies it as transition metal.

Atomic number

26

Symbol

Fe

Atomic weight (source value)

55.84

Electron configuration

[Ar]4s2 3d6

Standard state

Solid

Electronegativity (Pauling)

1.83

Melting point (K)

1811

Boiling point (K)

3134

Density (g/cm³)

7.874

Oxidation states

+3, +2

Understanding this entry

Atomic number is the number of protons in the nucleus. Properties are reference values and may depend on conditions and measurement conventions. An atomic weight is not the mass of every isotope. For elements without a standard atomic weight, a source may report an isotope mass number. Blank source values are shown as unavailable rather than estimated.

Further reading and reference: NIH PubChem source dataset ↗. Values and educational summaries are not a substitute for specialised advice.