different between arsane vs ursane

English

arsane (countable and uncountable, plural arsanes)

(inorganic chemistry, uncountable) The compound arsine, AsH₃
(inorganic chemistry, countable) Any saturated hydride of tervalent arsenic, of general formula As_nH_n+2, having an unbranched chain of arsenic atoms - diarsane, triarsane etc.

Organic derivatives of these compounds are arsines.

ursane (countable and uncountable, plural ursanes)

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