PERIODIC TABLE

Neptunium

Atomic No. 93 Np Neptunium

About Neptunium

As Neptunium is a radioactive element without any stable isotopes, Lorad Chemical does not manufacture any compounds that incorporate this element.

Properties

Atomic Number: 93
Atomic Symbol: Np
Atomic Mass: 237
CAS No.: 7439-99-8
Density: 20.45 g/cm³
Series: actinoid
Melting Point: 644°C
Boiling Point: 4,000°C
Thermal Conductivity: 0.06 W/cm °C
Heat of Fusion: 10 kJ/mol
Heat of Vaporization: 335 kJ/mol
Electronegativity: 1.36 pauling
Crystal Structure: Orthorhombic
Electrical Conductivity: 830000 S/m