Neptunium

Np Neptunium

237.048

Symbol

Atomic Number

Atomic Weight

237.048

Element Classification

Radioactive Rare Earth Elements(Actinide Series)

Discovered By

E.M. McMillan, P.H. Abelson

Discovery Date

1940 (United States)

Name Origin

Named for the planet Neptune.

Density (g/cc)

20.25

Melting Point (K)

913

Boiling Point (K)

4175

Appearance

Silvery metal

Atomic Radius (pm)

130

Atomic Volume (cc/mol)

21.1

Covalent Radius (pm)

n/a

Ionic Radius

95 (+4e) 110 (+3e)

Specific Heat

n/a

Fusion Heat (kJ/mol)

(9.6)

Evaporation Heat (kJ/mol)

336

Thermal Conductivity (@25°C W/m K)

(6.3)

Debye Temperature (K)

n/a

Pauling Negativity Number

1.36

First Ionizing Energy (kJ/mol)

n/a

Oxidation States

6, 5, 4, 3

Electronic Configuration

[Rn] 5f⁴ 6d¹ 7s²

Lattice Structure

Orthorhombic(ORC)

Lattice Constant

4.720

Lattice C/A Ratio

n/a

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Neptunium

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