What is the valency of oxygen in MgO?
Two
Oxygen (atomic number 8) has electronic configuration 2, 6. It needs 2 more electrons to complete its octet.
In MgO, magnesium (2, 8, 2) gives its 2 valence electrons to oxygen, forming Mg2+ and O2−. The combining capacity of oxygen is therefore 2.
Hence, the answer is Two.
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