D009405Level 6

Neptunium

**Definition:** A radioactive element of the actinide metals family. It has the atomic symbol Np, and atomic number 93.

**Tree numbers:** - D01.268.271.100.550 - D01.268.556.600 - D01.496.749.305.100.550 - D01.552.020.621 - D01.552.544.600

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