Periodex

General properties

Group

group 8

Period

period 4

Category

transition metals

Standard atomic weight

55.845(2)

Melting point

1811 K (1538 °C)

Boiling point

3134 K (2861 °C)

Phase at STP

solid

Additional properties

Block

d-block

Electron configuration

[Ar] 3d⁶ 4s²

Electrons per shell

2, 8, 14, 2

Electronegativity

1.83

Density

7.874 g/cm³

Oxidation states

−4, −2, −1, 0, +1, +2, +3, +4, +5, +6, +7 (an amphoteric oxide)

CAS Number

7439-89-6

Natural isotopes

Discovery history

Discovered by

ancient civilizations

Year of discovery

before 5000 BCE

Origin of name

The Anglo-Saxon name iren (ferrum in Latin)