Symbol: Pu
Atomic Number: 94
Atomic Weight: 244.0642
Element Classification: Radioactive Rare Earth Element (Actinide Series)
Discovered By: G.T.Seaborg, J.W.Kennedy, E.M.McMillan, A.C.Wohl
Discovery Date: 1940 (United States)
Name Origin: Named for the planet Pluto.
Density (g/cc): 19.84
Melting Point (K): 914
Boiling Point (K): 3505
Appearance: Silvery-white, radioactive metal
Atomic Radius (pm): 151
Atomic Volume (cc/mol): n/a
Covalent Radius (pm): n/a
Ionic Radius: 93 (+4e) 108 (+3e)
Specific Heat (@20°C J/g mol): n/a
Fusion Heat (kJ/mol): 2.8
Evaporation Heat (kJ/mol): 343.5
Thermal Conductivity (@25°C W/m K):
Debye Temperature (K): n/a
Pauling Negativity Number: 1.28
First Ionizing Energy (kJ/mol): 491.9
Oxidation States: 6, 5, 4, 3
Electronic Configuration: [Rn] 5f⁶ 7s²
Lattice Structure: Monoclinic (MCL)
Lattice Constant (Å): n/a
Lattice C/A Ratio: n/a