94
Pu
Plutonium
(244)
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#94
Plutonium
actinide· Solid·244 u
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.
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Identity
- Symbol
- Pu
- Atomic Number
- 94
- Atomic Mass
- 244 u
- Category
- actinide
- Block
- f-block
- Period
- 7
- Group
- 3
- Appearance
- silvery white, tarnishing to dark gray in air
- Year Discovered
- 1940 CE
- Discovered By
- Glenn T. Seaborg
- Named By
- Pluto
Electrons
- Configuration
- [Rn] 5f6 7s2
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f6
- Shells
- 2, 8, 18, 32, 24, 8, 2
- Electronegativity
- 1.28
- Electron Affinity
- -48.33
- Oxidation States
- +6, +5, +4, +3
- Ionization Energies
- 584.7
Physical Properties
- State at
- Solid
- Melting Point
- 912.5
- Boiling Point
- 3505
- Density
- 19.816
- Molar Heat
- 35.5 J/(mol·K)
- Crystal Structure
- Monoclinic
- Magnetic Ordering
- Paramagnetic
Mechanical
- Covalent Radius
- 187 pm
- Metallic Radius
- 159 pm
- Mohs Hardness
- 1.8
- Bulk Modulus
- 49 GPa GPa
- Shear Modulus
- 43 GPa GPa
- Young's Modulus
- 96 GPa GPa
Thermal & Electrical
- Thermal Conductivity
- 6.74 W/(m K) W/(m·K)
- Electrical Conductivity
- 0.667 MS/m S/m
- Specific Heat
- 130 J/(kg K) J/(g·K)
- Heat of Vaporization
- 333 kJ/mol kJ/mol
- Heat of Fusion
- 2.84 kJ/mol kJ/mol
Abundance
- Universe
- 0
- Sun
- 0
- Meteorite
- 0
- Earth's Crust
- 0
- Ocean
- 0
- Human Body
- 0