95
243 u
Am
Americium
Actinide
Atomic Structure
Physical State
Group
N/A
Period
7
Block
f
Electron Configuration
[Rn] 5f⁷ 7s²
Physical Properties
Atomic Mass:
243 u
Electronegativity:
1.3
Atomic Radius:
180 pm
Ionization Energy:
5.974 eV
Density:
13.69 g/cm³
Melting Point:
1449 K
Boiling Point:
2880 K
Historical Information
Discovered By:
Glenn T. Seaborg
Year Discovered:
1944