NO. 095Actinide

Am

Americium

Americium is a synthetic radioactive metal commonly used in smoke detectors. It is produced in nuclear reactors and has limited industrial applications.

Crystal Structure

Double hexagonal close-packed

Technical Specifications

Atomic Mass243 u

Density13.7 g/cm³

Melting Point1449 K

Boiling Point2880 K

Atomic Radius173 pm

Electronegativity1.3

Ionization Energy578 kJ/mol

Electron Affinity0 kJ/mol

Bonding TypeMetallic

Oxidation States2, 3, 4, 5, 6

Acid/BaseBasic

ReactivityMedium

Electron Configuration

[Rn] 5f7 7s2

Discovered ByGlenn T. Seaborg

Year1944

Known Isotopes

Am-241Am-243