94Solid
Pu 244 Atomic mass · uActinides
Plutonium
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.
Discovery 1940 (Glenn T. Seaborg)
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Physical properties
Values for the element in its standard state.
- Density
- 19.816g/cm³
- Melting point
- 913K
- Boiling point
- 3,503K
- Atomic radius
- Not available
- Bonding type
- Metallic
- Molar heat
- 35.5J/(mol·K)
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 10 electrons; 5s, 2 electrons; 5p, 6 electrons; 4f, 14 electrons; 5d, 10 electrons; 6s, 2 electrons; 6p, 6 electrons; 5f, 6 electrons; 7s, 2 electrons;
[Rn] represents 86 core electrons. The full view shows them explicitly.
94 electrons Orbital order preserved from source
- Electronegativity
- 1.28Pauling scale
- First ionization energy
- 585kJ/mol
- Electron affinity
- Not available
- Van der Waals radius
- Not available
Pu PlutoniumAtomic number 94
585kJ/mol
Atomic numberGaps indicate unavailable data
About plutonium
- Appearance
- Silvery white, tarnishing to dark gray in air
- Discovery
- 1940 (Glenn T. Seaborg)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.