Np
Neptunium Symbol (Np)
Neptunium is element 93 of the periodic table. Copy its symbol Np and see its atomic weight, electron configuration and physical properties.
What does Np mean?
Np is the chemical symbol for neptunium, element number 93 in the periodic table. Neptunium is an actinide in the f-block, period 7. It is a solid at room temperature and was discovered in 1940.
Codes and properties
| Chemical symbol | Np |
|---|---|
| Atomic number (Z) | 93 |
| Mass number (no standard atomic weight) | [237] |
| Group / period | f-block / 7 |
| Element category | actinide |
| Electron configuration | [Rn]7s² 5f⁴ 6d¹ |
| State at 20 °C | Solid |
| Oxidation states | +6, +5, +4, +3 |
| Electronegativity (Pauling) | 1.36 |
| Melting point | 917 K (643.85 °C) |
| Boiling point | 4175 K (3901.85 °C) |
| Density | 20.25 g/cm³ |
| Discovered | 1940 |
How to type Np
- Plain text: type
Np— element symbols are ordinary Latin letters, with the first letter capitalised and the second lowercase. - Subscripts in formulas: use Unicode subscript digits (₀₁₂₃₄₅₆₇₈₉) for formulas such as H₂O — copy them from the chemistry keyboard.
- LaTeX: write
\mathrm{Np}in math mode, or use the mhchem package:\ce{Np}. - HTML:
Np; for subscripts use<sub>, e.g.H<sub>2</sub>O.
Frequently asked questions
What is the chemical symbol for neptunium?
The chemical symbol for neptunium is Np.
What is the atomic number of neptunium?
Neptunium has atomic number 93, meaning each atom has 93 protons.
What is the electron configuration of neptunium?
The ground-state electron configuration of neptunium is [Rn]7s² 5f⁴ 6d¹.
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Reference: Neptunium on PubChem (NIH)