Periodex

General properties

Group

group 16 (chalcogens)

Period

period 6

Category

metalloids

Standard atomic weight

-

Melting point

527 K (254 °C)

Boiling point

1235 K (962 °C)

Phase at STP

solid

Additional properties

Block

p-block

Electron configuration

[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p⁴

Electrons per shell

2, 8, 18, 32, 18, 6

Electronegativity

2.0

Density

alpha: 9.196 g/cm³ beta: 9.398 g/cm³

Oxidation states

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

CAS Number

7440-08-6

Natural isotopes

Discovery history

Discovered by

Pierre Curie e Marie Curie

Year of discovery

1898

Origin of name

Poland, the native country of Marie Curie, who first isolated the element