Neptunium - Element Properties and Periodic Table Information

Neptunium - An element from the Periodic Table based on the IOUPAC 1985 standard

Chemical Elements

Periodic Table

Definition of the Neptunium Element
A radioactive metallic element that is chemically similar to uranium and is obtained in nuclear reactors as a by-product in the production of plutonium

Origin / Meaning of the name Neptunium
Neptunium  was named for the planet Neptune

Classification of the Neptunium Element
Neptunium classified as an element in the Actinide series as one of the "Rare Earth Elements" which can located in Group 3 elements of the Periodic Table and in the 6th and 7th periods. The Rare Earth Elements are of the Lanthanide and Actinide series. Most of the elements in the Actinide series are synthetic or man-made.

Facts about the Discovery and History of the Neptunium Element
Neptunium was discovered by Edwin McMillan and Philip Abelson in the USA in 1940

Occurrence the Neptunium Element
Man-made

Associated Uses of Neptunium
Neutron detection equipment
 

The Properties of the Neptunium Element
Name of Element : Neptunium
Symbol: Np
Atomic Number: 93
Atomic Mass: (237.0) amu
Melting Point: 640.0 °C - 913.15 °K
Boiling Point: 3902.0 °C - 4175.15 °K
Number of Protons/Electrons: 93
Number of Neutrons: 144
Crystal Structure: Orthorhombic
Density @ 293 K: 20.45 g/cm3
Color: Silvery

Neptunium and the Periodic Table
Check out Neptunium on the Periodic Table which arranges each chemical element according to its atomic number, as based on the periodic law, so that chemical elements with similar properties are in the same column. Our Periodic Table is simple to use - just click on the symbol for Neptunium for additional information and for an instant comparison of the Atomic Weight, Melting Point, Boiling Point and Mass - G/cc with any other element. An invaluable source of facts and information as a Chemistry reference guide.

Neptunium - IUPAC and the Modern Standardised Periodic Table
The Standardised Periodic Table in use today was agreed by the International Union of Pure Applied Chemistry, IUPAC, in 1985 and now recognises more periods and elements than Dimitri  Mendeleev knew in his day but still all fitting into his concept of  the "Periodic Table" in which Neptunium is just one element that can be found.
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The Element Neptunium

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