one atom of mg combines with one atom of "0" to given mgO then valence of mg is
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x+(-2)=0. x=+2. So, valency of Mg is +2. *Formal Charge=No. of valence electrons ... Of valence electrons and in the case of magnesium it has an electronic ... A neutral O2 atoms gains 2 electrons, it forms O2- ion. And Mg has O2+ ion. So that it combine Mg2+ and O2- in a 1:1 to give the ionic compound magnesium oxide.
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