Neptunium

Neptunium is a chemical element with the symbol Np and atomic number 93. A radioactive actinide metal, neptunium is the first transuranic element. Its position in the periodic table just after uranium, named after the planet Uranus, led to it being named after Neptune, the next planet beyond Uranus. A neptunium atom has 93 protons and 93 electrons...
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Neptunium

• (n.) A new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite. • (n.) A new metallic element, of doubtful genuineness and uncertain indentification, said to exist in certain minerals, as columbite.
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neptunium

<chemical> Neptunium. A radioactive element of the actinide metals family. It has the atomic symbol np, atomic number 93, and atomic weight 237. ... Chemical name: Neptunium ... (12 Dec 1998) ...
Found on http://www.encyclo.co.uk/local/20973

neptunium

(Np) (nep-too´ne-әm) a chemical element, atomic number 93, atomic weight 237.
Found on http://www.encyclo.co.uk/local/21001

neptunium

Np noun a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium
Found on https://www.encyclo.co.uk/local/20974

neptunium

(Np) Type: Term Pronunciation: nep-tū′nē-ŭm Definitions: 1. A radioactive element; atomic no. 93; first element of the transuranian series (not found in nature); 237Np has a half-life of 2.14 ׀ 106 years.
Found on http://www.medilexicon.com/medicaldictionary.php?t=59269

Neptunium

Nep·tu'ni·um noun [ New Latin ] A new metallic element, of doubtful genuineness and uncertain identification, said to exist in certain minerals, as columbite. Hermann.
Found on http://www.encyclo.co.uk/webster/N/15

neptunium

neptunium (neptOO'nēum) , radioactive chemical element; symbol Np; at. no. 93; at. wt. 237.0482; m.p. about 640°C; b.p. 3,902°C (estimated); sp. gr. 20.25 at 20°C; valence +3, +4, +5, or +6. Neptunium is a ductile, silvery radioactive metal. It is a member of the actinide serie...
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Neptunium

Produced artificially by nuclear reaction between uranium and neutrons. Symbol Np
Found on http://www.diracdelta.co.uk/science/source/n/e/neptunium/source.html

neptunium

radioactive chemical element of the actinoid series of the periodic table, first transuranium element to be artificially produced, atomic number 93. ... [6 related articles]
Found on http://www.britannica.com/eb/a-z/n/26

neptunium

Silvery, radioactive metallic element of the actinide series, atomic number 93, relative atomic mass 237.048. It occurs in nature in minute amounts in pitchblende and other uranium ores, where it is produced from the decay of neutron-bombarded uranium in these ores. The longest-lived isotope, Np-237, has a half-life of 2.2 million y...
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neptunium

[n] - a radioactive transuranic metallic element
Found on http://www.webdictionary.co.uk/definition.php?query=neptunium
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