Question

Define valency in terms of oxygen

Answer 1

 The number of hydrogen atoms that can combine with an element in a binary hydride or twice the number of oxygen atoms combining with an element in its oxide or oxides. 


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Answer 2

The valency is the combining capacity of an atom. The number of Electrons donated or accepted or shared by an atom of an element, so as to have a stable configuration of the nearest noble gas is called Valency.
Oxygen (8)
K=2 L=6
In outermost shell there is 6 electrons.
So, the valency of oxygen will be
8-6=2.
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