Neptunium (Np) is a chemical element belonging to the category Inner transition metal, with atomic number 93 and atomic mass 237.0000 u. This sheet describes its fundamental properties, periodic position and physical characteristics.
Stays within its layerAstronomy
Neighbourhood in the graph
Above, what contains it; below, what it contains; on the right, what links it to another layer.
Astronomy · Chemical element
Neptunium
EL2L
Identity
Name: Neptunium
Symbol: Np
Atomic number: 93
Atomic mass: 237.0000 u
Position in the periodic table
Group: 3
Period: 7
Category: Inner transition metal
Physico-chemical properties
Standard state: Solid
Melting point: About 640°C
Density: Very high
Electron configuration: [Rn] 5f⁴ 6d¹ 7s²
Scientific description
Neptunium is a chemical element with symbol Np and atomic number 93.
It belongs to the category of Inner transition metal and occupies group 3 and period 7.
Its standard atomic mass is 237.0000 u.