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neptuniumThe Columbia Encyclopedia. Copyright © 2001-09 Columbia University Press. All rights reserved.
- Periodic Table of the Elements: Neptunium
Periodic Table of the Elements: NeptuniumAtomic Number:93Atomic Symbol:NpNeptuniumAtomic Weight:237.0482ElectronConfiguration:2 · 8 · 1832 · 229 · 2
- Np
Np, symbol for element neptunium.
- McMillan, Edwin Mattison
McMillan, Edwin Mattison, 1907–91, American physicist, b. Redondo Beach, Calif., grad. California Institute of Technology, 1928, Ph.D. Princeton, 1932. On the faculty of the Univ. of Californi...
- actinide series
Actinide series, a series of radioactive metallic elements in Group 3 of the periodic table. Members of the series are often called actinides, although actinium (at. no. 89) is not always cons...
- plutonium
Plutonium, radioactive chemical element; symbol Pu; at. no. 94; mass no. of most stable isotope 244; m.p. 641°C; b.p. 3,232°C; sp. gr. 19.84 at 20°C; valence +3, +4, +5, or +6. Plutonium is a ...
- transuranium elements
Transuranium elements, in chemistry, radioactive elements with atomic numbers greater than that of uranium (at. no. 92). All the transuranium elements of the actinide series were discovered as...
- radioactivity
Radioactivity, spontaneous disintegration or decay of the nucleus of an atom by emission of particles, usually accompanied by electromagnetic radiation. The energy produced by radioactivity ha...
- Elements (table)
ElementsElementSymbolAtomic NumberAtomic Weight1Melting Point(Degrees Celsius)Boiling Point(Degrees Celsius)1 Parentheses indicate most stable isotope.actiniumAc89227.02781050.3200....
- element
Element, in chemistry, a substance that cannot be decomposed into simpler substances by chemical means. A substance such as a compound can be decomposed into its constituent elements by means ...
