93
Np
Neptunium
237.0 u
Neptunium
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Period
7
Group
—
Block
f-block
Phase (STP)
Solid
Neptunium was the first synthetic transuranium element, named after the planet Neptune. It is a byproduct in nuclear reactors.
More Actinide
Frequently Asked Questions
What is Neptunium?
Neptunium (Np) is a chemical element with atomic number 93. It is a solid at standard temperature and pressure, classified as a actinide.
What are the key properties of Neptunium?
Neptunium has an atomic mass of 237.0 u.
What is the electron configuration of Neptunium?
The electron configuration of Neptunium is [Rn] 5f4 6d1 7s2. It is in the f-block of the periodic table.
What is the electronegativity of Neptunium?
Neptunium has an electronegativity of 1.36 on the Pauling scale.