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Q.

Valency of oxygen is [[1]]

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answer is 2.

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Detailed Solution

Valency is the combining power of atoms of an element with other atoms to form a molecule.
For Oxygen,
Atomic Number = 8
Electronic configuration = (2,6)
Oxygen needs 2 electrons to complete its outermost orbit/shell. It does that by gaining two electrons and so the valency of oxygen is 2.
 

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Valency of oxygen is [[1]]