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Neptunium ✕
Symbol Np
Atomic number 93
Chemical property Actinide
Origin o the name Neptune, the eighth planet in the Solar System
Period 7
Density (g/cm³) 20.45
Melting point (K) 917
Boiling point (K) 4273
Electro-negativity 1.36
Abundance in earth's crust (mg/kg) 0