89
227 u
Ac
Actinium
Actinide
Atomic Structure
Physical State
Group
3
Period
7
Block
f
Electron Configuration
[Rn] 6d¹ 7s²
Physical Properties
Atomic Mass:
227 u
Electronegativity:
1.1
Atomic Radius:
215 pm
Ionization Energy:
5.17 eV
Density:
10.07 g/cm³
Melting Point:
1323 K
Boiling Point:
3471 K
Historical Information
Discovered By:
Friedrich Oskar Giesel
Year Discovered:
1902