alleryStart learning →Following the reporting convention, how are a 2+ charge and a plus two oxidation number written?
ABoth are written sign first, as +2
BBoth are written number first, as 2+
CCharge is 2+ and oxidation number is +2
DCharge is +2 and oxidation number is 2+
Answer & Solution
Correct answer: C. Charge is 2+ and oxidation number is +2
1. Charge is reported with the number first and the sign after it, giving 2+.
2. Oxidation number is reported in the reverse order, sign first, giving +2.
3. The two orders are deliberately different so that the two properties are not confused.
4. Writing both the same way loses that distinction.
5. So a calcium ion carries charge 2+ while calcium in CaCl2 has oxidation number +2.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 4 "Stoichiometry of Chemical Reactions", section 4.2 Classifying Chemical Reactions_
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