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Because Na+ has less electrons than Na which means Na+ will be a smaller atom (give me brainliest please)
I would say d
Hope that helps :)
Long Answer:
Ionic: Cation is named first followed by the anion.
If it's an ionic compound with a transition metal, there are more than one possible ion. Molecular - named with the least electronegative ion first + prefixes are given to both ions to indicate number of atoms in each element.
Short Answer: Ionic compounds- Cation is named first, followed by the anion.