Neptunium: the essentials

Neptunium is a radioactive rare earth metal and has at least 3 allotropic forms. It is named for the planet Neptune. Np-237 is a by-product from nuclear reactors.

Neptunium: historical information

Neptunium was discovered by Edwin M. McMillan and P. H. Abelson in 1940 at USA. Origin of name: named after "the planet Neptune".

Neptunium was the first synthetic transuranium element of the actinide series. It was discovered by McMillan and Abelson in 1940 at Berkeley, California, USA, who bombarded uranium with neutrons produced from a cyclotron. It was the first synthetic transuranium (elements after uranium) element discovered.

Neptunium around us Read more »

Neptunium has no biological role.

Trace amounts of neptunium are present in uranium ores. In practice, isolable amounts are best extracted from spent uranium fuel rods produced in nuclear reactors.

Abundances for cobalt in a number of different environments. More abundance data »
Location ppb by weight ppb by atoms Links
Universe (no data) (no data) Chemical elements abundance by weight in the universe on a miniature periodic table spark table
Crustal rocks (no data) (no data) Chemical elements abundance by weight in the earth's crust on a miniature periodic table spark table
Human (no data) ppb by weight (no data) atoms relative to C = 1000000 Chemical elements abundance by weight in humans on a miniature periodic table spark table

Physical properties Read more »

Heat properties Read more »

Crystal structure Read more »

The solid state structure of neptunium is: orthorhombic.

Neptunium: orbital properties Read more »

Neptunium atoms have 93 electrons and the shell structure is 2.8.18.32.22.9.2. The ground state electronic configuration of neutral Neptunium is [Rn].5f4.6d1.7s2 and the term symbol of Neptunium is 6L11/2.

Isolation

Isolation: coming soon!

Neptunium isotopes Read more »

Table. Stables isotopes of cobalt.
Isotope Mass
/Da
Natural
abund.
(atom %)
Nuclear
spin (I)
Nuclear
magnetic
moment (μ/μN)
nil

WebElements Shop

You can buy periodic table posters, mugs, T-shirts, fridge magnets, games, molecular models, and more at the WebElements shop