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This question already has an answer here:

Is $\ce{Cu^{2+}}$ or $\ce{Cu^{+2}}$ correct? In my book the author uses both but at different places.

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marked as duplicate by Martin - マーチン Jan 1 '17 at 13:19

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ Why is this downvoted? $\endgroup$ – MrAP Jan 1 '17 at 13:05
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    $\begingroup$ Because it is a duplicate. $\endgroup$ – Nilay Ghosh Jan 1 '17 at 13:26
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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.

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