93
Np
Neptunium
(237)
2818322292
#93
Neptunium
actinide· Solid·237 u
Neptunium is a chemical element with symbol Np and atomic number 93. A radioactive actinide metal, neptunium is the first transuranic element. Its position in the periodic table just after uranium, named after the planet Uranus, led to it being named after Neptune, the next planet beyond Uranus.
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Identity
- Symbol
- Np
- Atomic Number
- 93
- Atomic Mass
- 237 u
- Category
- actinide
- Block
- f-block
- Period
- 7
- Group
- 3
- Appearance
- silvery metallic
- Year Discovered
- 1940 CE
- Discovered By
- Edwin McMillan
- Named By
- Neptune
Electrons
- Configuration
- [Rn] 5f4 6d1 7s2
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f4 6d1
- Shells
- 2, 8, 18, 32, 22, 9, 2
- Electronegativity
- 1.36
- Electron Affinity
- 45.85
- Oxidation States
- +6, +5, +4, +3
- Ionization Energies
- 604.5
Physical Properties
- State at
- Solid
- Melting Point
- 912
- Boiling Point
- 4447
- Density
- 20.45
- Molar Heat
- 29.46 J/(mol·K)
- Crystal Structure
- Orthorhombic
- Magnetic Ordering
- Paramagnetic
Mechanical
- Covalent Radius
- 190 pm
- Metallic Radius
- 155 pm
Thermal & Electrical
- Thermal Conductivity
- 6.3 W/(m K) W/(m·K)
- Specific Heat
- 120 J/(kg K) J/(g·K)
- Heat of Vaporization
- 336 kJ/mol kJ/mol
- Heat of Fusion
- 3.2 kJ/mol kJ/mol
Abundance
- Universe
- 0
- Sun
- 0
- Meteorite
- 0
- Earth's Crust
- 0
- Ocean
- 0
- Human Body
- 0