Symbol
Ac
Atomic Number
89
Atomic Mass
227
Protons
89
Neutrons
138
Electrons
89
Type
Actinide
Isotopes
Actinium-227
Discovery Year
1899
Discovered By
Friedrich Oskar Giesel
Group
3
Period
7
Boiling Point
1050°C
Melting Point
1050°C
Electron Configuration
[Rn] 7s² 6d¹
Density (g/cm³)
10.07
Crystal Structure
Hexagonal
Magnetism
Paramagnetic
Abundance in Earth's Crust
0.0007%
Phase at Room Temperature
Solid