Etymology
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element (n.)
c. 1300, "earth, air, fire, or water; one of the four things regarded by the ancients as the constituents of all things," from Old French element (10c.), from Latin elementum "rudiment, first principle, matter in its most basic form" (translating Greek stoikheion), origin and original sense unknown. Meaning "simplest component of a complex substance" is late 14c. Modern sense in chemistry is from 1813, but is not essentially different from the ancient one. Meaning "proper or natural environment of anything" is from 1590s, from the old notion that each class of living beings had its natural abode in one of the four elements. Elements "atmospheric force" is 1550s.
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americium (n.)

artificial radioactive element, 1946, from America + metallic element ending -ium.

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niobium (n.)

metallic element, 1845, named by German scientist Heinrich Rose, who discovered it in 1844 in the mineral tantalite (the source of the element and name tantalum) and columbite. The element was so called because in Greek mythology Niobe was the daughter of Tantalus. With metallic element ending -ium. Related: Niobic.

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nobelium (n.)

transuranic element, 1957, named for Alfred Nobel (q.v.). With metallic element ending -ium.

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fizgig (n.)
"light, frivolous woman," 1520s, first element of uncertain origin, second element is Middle English gig "frivolous person" (see gig (n.1)).
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lutetium (n.)
rare metallic element, 1907, from French lutécium, from Latin Lutetia, representing "Paris" (see Paris) + metallic element ending -ium.
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Gustavus 
masc. proper name, Latinized form of Swedish Gustaf; first element of unknown origin, second element literally "staff." Related: Gustavian.
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sodium (n.)
metallic alkaline element, 1807, coined by English chemist Humphry Davy from soda; so called because the element was isolated from caustic soda (sodium hydroxide). The chemical symbol Na is from natrium, alternative name for the element proposed by Berzelius from natron, a name of a type of soda.
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europium (n.)
rare earth element, 1901, named by its discoverer, French chemist Eugène Demarçay (1852-1903) in 1896, from Europe. With metallic element ending -ium.
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gadolinium (n.)
metallic element, with element ending -ium + gadolinia, an earth named 1886 by J.C. Marginac in honor of Johan Gadolin (1760-1852), Finnish mineralogist and chemist, who in 1794 first began investigation of the earth (subsequently called gadolinite, 1802) which eventually yielded this element and several others.
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