Periodex

General properties

Group

group 18 (noble gases)

Period

period 7

Category

unknown

Standard atomic weight

-

Melting point

320 K (predicted)

Boiling point

350±30 K (extrapolated)

Phase at STP

solid (predicted)

Additional properties

Block

p-block

Electron configuration

[Rn] 5f¹⁴ 6d¹⁰ 7s² 7p⁶ (predicted)

Electrons per shell

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

Electronegativity

–

Density

4.9–5.1 g/cm³ (predicted)

Oxidation states

(−1), (0), (+1), (+2), (+4), (+6) (parenthesized: prediction)

CAS Number

54144-19-3

Natural isotopes

Discovery history

Discovered by

Joint Institute for Nuclear Research and Lawrence Livermore National Laboratory

Year of discovery

2002

Origin of name

The nuclear physicist Yuri Oganessian