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 (@20C J/g mol): n/a
Fusion Heat (kJ/mol): 2.8
Evaporation Heat (kJ/mol): 343.5
Thermal Conductivity (@25C 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 (): n/a
Lattice C/A Ratio: n/a

Note: Plutonium is radioactive material, care is advised. Work should be carried out in glove boxes with proper ventilation or "hot cells" if critical radiation limit is surpassed. In any case, check radiation.

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