Actinium

Symbol: Ac
Atomic Number: 89
Atomic Weight: 227.0278
Element Classification: Radioactive Rare Earth Element (Actinide Series)
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 (@20C J/g mol): n/a
Fusion Heat (kJ/mol): (10.5)
Evaporation Heat (kJ/mol): (292.9)
Thermal Conductivity (@25C W/m K):
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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