94 Pu 244
Plutonium
ACTINIDE
Phase: Solid
Discovered: Glenn T. Seaborg
Block: F
Summary
Plutonium is a transuranic radioactive chemical element with symbol Pu and atomic number 94. It is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. The element normally exhibits six allotropes and four oxidation states.
Appearance: silvery white, tarnishing to dark gray in air
Source: WikipediaPhysical Properties
Atomic Mass 244 u
Density 19.816 g/cm³
Melting Point 912.5 K
Boiling Point 3505 K
Molar Heat 35.5 J/(mol·K)
Electron Affinity -48.33 kJ/mol
Ionization Energies
1st: 584.7 kJ/mol