NO. 102Actinide

No

Nobelium

Nobelium is a short-lived synthetic actinide. It is notable for favoring a +2 oxidation state compared to other actinides.

Crystal Structure

Hexagonal close-packed (predicted)

Atomic Mass259 u

Density9.9 g/cm³

Melting Point1100 K

Boiling Point1050 K

Atomic Radius190 pm

Electronegativity1.3

Ionization Energy642 kJ/mol

Electron Affinity0 kJ/mol

Bonding TypeMetallic

Oxidation States2, 3

Acid/BaseBasic

ReactivityHigh

Electron Configuration

[Rn] 5f14 7s2

Discovered ByJoint Institute for Nuclear Research

Year1958

Known Isotopes

No-259