93

Radioactive

Np

Neptunium

(237)

Actinide
Solid

Discovery

McMillan, Edwin M. & Abelson, Philip H. (1940)

Etymology

Latin

Meaning

Neptune

Electron configuration

Electron configuration

Crystal structure

Crystal structure

Orthorhombic

Physical Properties

Phase

  (at 21 °C and 101.325 kPa)

Solid

Melting point

  (at 101.325 kPa)

640.0 °C

913.15 K

Boiling point

  (at 101.325 kPa)

3818.0 °C

4091.15 K

Density

  (at 21 °C and 101.325 kPa)

18.95 g/cm3

Electronegativity

1.36