Atomic Number of Neptunium

Neptunium Atomic Number

Atomic Number of Neptunium is 93.

Chemical symbol for Neptunium is Np. Number of protons in Neptunium is 93. Atomic weight of Neptunium is 237 u or g/mol. Melting point of Neptunium is 640 °C and its the boiling point is 3902 °C.

» Boiling Point » Melting Point » Abundant » State at STP » Discovery Year

Properties of Neptunium Element

Atomic Number (Z)93
Atomic SymbolNp
Atomic Weight237 u
Density20.45 g/cm3
Melting Point (K)917 K
Melting Point (℃)640 °C
Boiling Point (K)4273 K
Boiling Point (℃)3902 °C
Heat Capacity
Abundance≤ 3×10−12 mg/kg
State at STPSolid
Electronegativity (Pauling) χ1.36
Ionization Energy (eV)6.2657
Atomic Radius175pm
Covalent Radiusno datapm
Valence Electrons2
Year of Discovery1940
DiscovererMcMillan and Abelson

What is the Boiling Point of Neptunium?

Neptunium boiling point is 3902 °C. Boiling point of Neptunium in Kelvin is 4273 K.

What is the Melting Point of Neptunium?

Neptunium melting point is 640 °C. Melting point of Neptunium in Kelvin is 917 K.

How Abundant is Neptunium?

Abundant value of Neptunium is ≤ 3×10−12 mg/kg.

What is the State of Neptunium at Standard Temperature and Pressure (STP)?

State of Neptunium is Solid at standard temperature and pressure at 0℃ and one atmosphere pressure.

When was Neptunium Discovered?

Neptunium was discovered in 1940.

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