in the above ruels to ditermine the oxidation No. the second point states
The oxidation number of a monoatomic ion is equal to the charge of the ion. For example, Mg²⁺ has oxidation number +2; Cl⁻ has oxidation number −1.
here Mg²⁺ is not a monoatomic ion ?

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Solution

Yes! the Mg⁺² is a monoatomic divalent cation, means it has only one atom so it is a monoatomic ion while it has a double + charge so it is a divalent cation.
The polyatomic ion means an ion which has more than one atoms like CO₃^-2 is a polyatomic cation.
In case of Mg⁺² ion, the oxidation no. is equal to the charge i.e. +2 .

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