Neptunium (Np) — Actinide. Atomic number 93.
Silvery radioactive metal
- Atomic number: 93
- Symbol: Np
- Atomic mass: [237] u
- Category: Actinide
- State: Solid
- Melting point: 643.85 °C / 917 K
- Boiling point: 3999.85 °C / 4273 K
- Density: 20.45 g/cm³ (20°C)
- Electron configuration: [Rn] 5f4 6d1 7s2
- Oxidation states: +3, +4, +5, +6, +7
- Electronegativity: 1.36
- Discovered by: Edwin McMillan and Philip Abelson (1940)
Common uses: Neutron detectors, Research
Biological role: No biological role.
Frequently Asked Questions about Neptunium
What is the atomic number of neptunium?
Neptunium has an atomic number of 93, meaning each atom contains 93 protons in its nucleus.
What is the atomic mass of neptunium?
The standard atomic weight of neptunium is [237] u (unified atomic mass units).
What category does neptunium belong to?
Neptunium is classified as a actinide.
What is the state of neptunium at room temperature?
Neptunium is a solid at 20 °C (68 °F).
What is the melting point of neptunium?
The melting point of neptunium is 643.85 °C / 917 K.
What is the boiling point of neptunium?
The boiling point of neptunium is 3999.85 °C / 4273 K.
What is the density of neptunium?
The density of neptunium is 20.45 g/cm³ (20°C).
What is the electronegativity of neptunium?
Neptunium has a Pauling electronegativity of 1.36.
What is the electron configuration of neptunium?
The electron configuration of neptunium is [Rn] 5f4 6d1 7s2.
What are the common oxidation states of neptunium?
Neptunium commonly exhibits the following oxidation states: +3, +4, +5, +6, +7.
When was neptunium discovered?
Neptunium was discovered in 1940 by Edwin McMillan and Philip Abelson.
Is neptunium radioactive?
Neptunium is a synthetic radioactive element that does not occur naturally and must be produced in a laboratory.
What is the biological role of neptunium?
No biological role.
What are the common uses of neptunium?
Neptunium is used for: Neutron detectors; Research.
