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Name Neptunium
Atomic Number 93
Atomic Weight (237)
Symbol Np
Melting Point ( °C ) 912±3 K ​(639±3 °C, ​1182±5 °F)
Boiling Point ( °C ) 4447 K ​(4174 °C, ​7545 °F)
Density (g/cm3) alpha: 20.45 g·cm−3[1] (at 0 °C, 101.325 kPa)

accepted standard value: 19.38 g·cm−3

Earth crust (%)
Discovery (Year) 1940
Group N/A, F Block
Electron configuration Rn 5f4 6d1 7s2
Ionization energy (eV) 1st: 604.5 kJ·mol−1

Neptunium is a chemical element that has a atomic nuber of 93 and a estimated weight of 237. It is A radioactive actinide metal and has a Silvery and metallic look. Neptunium was discovered in 1940 by Edwin McMillan and Philip H. Abelson at the Berkeley Radiation Laboratory in 1940. This element is located in the F block and has no Group.