Is $\ce{Cu^{2+}}$ or $\ce{Cu^{+2}}$ correct? In my book the author uses both but at different places.
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The standard notation for ions is 2+, not +2.
The net charge is written with the magnitude before the sign; that is, a doubly charged cation is indicated as 2+ instead of +2.
answered Jan 1, 2017 at 12:37