93
Np
Neptunium
Neptunium
Neptunium (Np)
Actinides · Solid · Period 7 · Group 3
Element Properties
- Atomic Number
- 93
- Symbol
- Np
- Atomic Mass
- 237.0482
- Category
- Actinides
- Standard State
- Solid
- Period
- 7
- Group
- 3
- Electronegativity
- 1.36
- Atomic Radius
- 221
- Ionization Energy
- 6.27
- Electron Affinity
- —
- Oxidation States
- +6, +5, +4, +3
- Melting Point
- 917 K (643.85 °C)
- Boiling Point
- 4175 K (3901.85 °C)
- Density
- 20.25
- Electron Configuration
- [Rn]7s2 5f4 6d1
- Year Discovered
- 1940
Electron shells
[Rn]7s2 5f4 6d1
Electrons are arranged in shells (principal energy levels) around the nucleus. The diagram is a schematic — orbitals in the same shell are not drawn separately.
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Frequently asked questions
What is the atomic number of Neptunium?
The atomic number of Neptunium is 93, which equals the number of protons in its nucleus.
What is the atomic mass of Neptunium?
The atomic mass of Neptunium is approximately 237.0482 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Neptunium?
The electron configuration of Neptunium is [Rn]7s2 5f4 6d1.
Where is Neptunium in the periodic table?
Neptunium is located in period 7, group 3.
When was Neptunium discovered?
Neptunium was discovered in 1940.
Related elements
Same group
21
Sc
Scandium
44.956
39
Y
Yttrium
88.906
57
La
Lanthanum
138.905
58
Ce
Cerium
140.116
59
Pr
Praseodymium
140.908
60
Nd
Neodymium
144.24