Actinium
Symbol
Ac
Atomic Number
89
Atomic Weight
227.0278
Element Classification
Discovered By
Andre-Louis Debierne
Discovery Date
1899 (France)
Name Origin
Greek: akis, aktinos (ray).
Density (g/cc)
n/a
Melting Point (K)
1320
Boiling Point (K)
3470
Appearance
Heavy, Silvery-white metal that is very radioactive
Atomic Radius (pm)
188
Atomic Volume (cc/mol)
22.54
Covalent Radius (pm)
n/a
Ionic Radius
118 (+3e)
Specific Heat
n/a
Fusion Heat (kJ/mol)
(10.5)
Evaporation Heat (kJ/mol)
(292.9)
Thermal Conductivity (@25°C W/m K)
n/a
Debye Temperature (K)
n/a
Pauling Negativity Number
1.1
First Ionizing Energy (kJ/mol)
665.5
Oxidation States
3
Electronic Configuration
[Rn] 6d1 7s2
Lattice Structure
Face-Centered Cubic(FCC)
Lattice Constant
5.310
Lattice C/A Ratio
n/a
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