Periodex

General properties

Group

group 2 (alkaline metals)

Period

period 7

Category

alkaline earth metals

Standard atomic weight

-

Melting point

973 K (700 °C)

Boiling point

2010 K (1737 °C)

Phase at STP

solid

Additional properties

Block

s-block

Electron configuration

[Rn] 7s²

Electrons per shell

2, 8, 18, 32, 18, 8, 2

Electronegativity

0.9

Density

5.5 g/cm³

Oxidation states

+2

CAS Number

7440-14-4

Natural isotopes

Discovery history

Discovered by

Pierre Curie och Marie Curie

Year of discovery

1898

Origin of name

The Latin 'radius', meaning ray