All chemical elements

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