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单词 θ68982
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the world > matter > chemistry > elements and compounds > metals > specific elements > astatine > [noun] (5)
alabamine1932

(A name proposed for) the chemical element astatine. Cf. anglo-helvetium, n.

helvetium1940

Earlier name for astatine, n. Cf. also alabamine, n. and anglo-helvetium, n. (Disused.)

anglo-helvetium1942

A proposed name for: the element astatine. Cf. alabamine, n.

astatine1947

A radioactive element of short half-life, which is rare in nature but can be made artificially; the heaviest element of the halogen group. (Formerly…

At1947

The element astatine.

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