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Neptunium


93

Np

Neptunium
237.04820
2
8
18
32
8
2
2
5

Source

Neptunium is a chemical element with symbol Np and atomic number 93. A radioactive actinide metal, neptunium is the first transuranic element. Its position in the periodic table just after uranium, named after the planet Uranus, led to it being named after Neptune, the next planet beyond Uranus.