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25 February, 08:27

Which metal atom below cannot form a cation of several different charges?

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  1. 25 February, 08:57
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    Missing question: Cr, Mn, Fe, Ba, Cu.

    Answer is: Ba (barium).

    Barium is metal from second group of periodic table of elements. Barium looses two electrons and has oxidation number + 2.

    Chromium has different oxidation numbers, usually + 3 and + 6, iron has oxidation numbers + 2 and + 3, copper + 1 and + 2 in their compounds.
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