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MgO

Magnesium: 2 Valance Electrons (Charge is +2)

Oxide: 6 Valance Electrons (Charge is -2)

Hint: Oxide has a charge of -2 and so does Oxygen. Check the Periodic Table for the elements that have a -2 charge (group 16) and you will find oxygen as the first element in that group. Periods define how many energy levels the element has, just so you know. Oh and this is ionic.

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Q: How many valence electrons does magnisium oxide have?
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