N

Neptunium

Quick Reference
Formula / NotationNp
Molecular Weight237
CategoryElements

What is Neptunium?

Neptunium is the first transuranic element, created artificially in 1940 by bombarding uranium with neutrons. It is found in trace quantities in uranium ores as a decay product. It was named after the planet Neptune.

Formula & Notation

Np

Properties & Characteristics

Appearance: silvery metal. Melting point: 639 °C. Boiling point: 4000 °C. Density: 20.2 g/cm³.

Uses & Applications

Neptunium-237 is used in neutron detection equipment. Precursor to plutonium-238 production (used in radioisotope thermoelectric generators for spacecraft).

Safety Information

Radioactive hazard. Regulated as special nuclear material. Accumulates in bone and liver.

Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.

Key Facts

Term Neptunium
Formula Np
Molecular Weight 237
Category Elements

Frequently Asked Questions

Neptunium is the first transuranic element, created artificially in 1940 by bombarding uranium with neutrons. It is found in trace quantities in uranium ores as a decay product. It was named after the planet Neptune.

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