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electron dot structure of calcium oxide

 CaO

                 xx  

xx Ca   xx O xx

Ca 's two electrons and O's 6 electrons combine and forms a covalent bond.

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calcium has 2 valence electrons while oxygen has 6 valence electrons. when adding calcium and oxygen together they for calcium oxide or CaO and calciums 2 valence electrons join with oxygens 6 to fill the Lewis structure.
Ca 2+ [O with 8e-] 2-

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