MgO is a compund or element
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Explanation:
valence electrons
…the ionic compound MgO (magnesium oxide). (Although the compound magnesium oxide contains charged species, it has no net charge, because it contains equal numbers of Mg2+ and O2− ions.) Likewise, oxygen reacts with calcium (just below magnesium in Group 2) to form CaO (calcium oxide).
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Answer:
MgO is a compound and magnesium and oxygen are elements present in it
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