Explain elements name

[lulu2007]

please help me w/ this 2 problems, thanks!

Q₁: Explain why the name for MgCl₂ is magnesium chloride but the name for CuCl₂ is copper (II) chloride.

Q₂: Does the fact that two elements combine in a one-to-one atomic ratio means that the charges on their ions are both 1? Explain.

[Vitalii]

Q₁: Becuse there are different copper chlorides.

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CuCl2

is copper (II) chloride
and

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CuCl

is copper (I) chloride

Q₂: No, that only means that they have the same absolute values of charges.
In

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MgO

,

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Mg{2+}

and

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O{2-}