A monatomic ion is an ion consisting of a single atom. If an ion contains more than one atom, even if these atoms are of the same element, it is called a polyatomic ion. For example, calcium carbonate consists of the monatomic ion Ca2+ and the polyatomic ion CO32-. A type I binary ionic compound contains a metal (cation) that forms only one type o...
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http://en.wikipedia.org/wiki/Monatomic_ion
An ion formed from a single atom by the loss or gain of electrons. See also: Electron, Ion.
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https://www.encyclo.co.uk/local/20687
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