The rules for naming polyatomic ionic compounds are as follows:
1. The metal keeps its name and is named and written first.
– For transition metals, we use Roman numerals to denote its charge.
2. Name the polyatomic ion as you would normally.
The rules for naming the water part:
1. H2O shall bear the name hydrate
2. The coefficient shall be named according to the prefixes:
1 - mono
2 - di
Name the hydrate MgSO4 • 7H2O.
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