Periodex

General properties

Group

n/a

Period

period 7

Category

actinoids

Standard atomic weight

-

Melting point

1613 K (1340 °C)

Boiling point

3383 K (3110 °C)

Phase at STP

solid

Additional properties

Block

f-block

Electron configuration

[Rn] 5f⁷ 6d¹ 7s²

Electrons per shell

2, 8, 18, 32, 25, 9, 2

Electronegativity

1.28

Density

13.51 g/cm³

Oxidation states

+2, +3, +4, +5, +6 (an amphoteric oxide)

CAS Number

7440-51-9

Natural isotopes

Discovery history

Discovered by

Glenn T. Seaborg、Ralph A. James和Albert Ghiorso

Year of discovery

1944

Origin of name

Pierre Curie, a physicist, and Marie Curie, a physicist and chemist