Periodex

General properties

Group

group 14

Period

period 4

Category

metalloids

Standard atomic weight

72.630(8)

Melting point

1211.40 K (938.25 °C)

Boiling point

3106 K (2833 °C)

Phase at STP

solid

Additional properties

Block

p-block

Electron configuration

[Ar] 3d¹⁰ 4s² 4p²

Electrons per shell

2, 8, 18, 4

Electronegativity

2.01

Density

5.323 g/cm³

Oxidation states

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

CAS Number

7440-56-4

Natural isotopes

Discovery history

Discovered by

Clemens Winkler

Year of discovery

1886

Origin of name

Germany (with the Latin name Germania)