1) Atomic number 93 2) Chemical element 3) Element discovered in 1940 4) Element number 93 5) Element with the symbol Np 6) Metal 7) Metallic element 8) Synthetic element
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1) Np
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https://www.crosswordclues.com/clue/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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http://en.wikipedia.org/wiki/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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http://thinkexist.com/dictionary/meaning/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]
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http://www.britannica.com/eb/a-z/n/26
<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) ...
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http://www.encyclo.co.uk/local/20973
(Np) (nep-too´ne-әm) a chemical element, atomic number 93, atomic weight 237.
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http://www.encyclo.co.uk/local/21001
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
(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.
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http://www.medilexicon.com/medicaldictionary.php?t=59269
[
n] - a radioactive transuranic metallic element
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http://www.webdictionary.co.uk/definition.php?query=neptunium
Produced artificially by nuclear reaction between uranium and neutrons. Symbol Np
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https://www.encyclo.co.uk/local/20687
Np noun a radioactive transuranic metallic element; found in trace amounts in uranium ores; a by-product of the production of plutonium
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https://www.encyclo.co.uk/local/20974
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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https://www.encyclo.co.uk/local/21221
a transuranic element produced in nuclear reactors by the neutron bombardment of U-238: decays rapidly to plutonium and then to U-235. Symbol: Np; at. no.: 93.
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https://www.infoplease.com/dictionary/neptunium
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