What is the difference between valency and oxidation number.

The greatest number of electrons that an atom can lose or gain is called valency, but the actual number of electrons that an element loses or gains to form a molecule is called oxidation number. The valency of an isolated atom is computed, whereas the oxidation state of an atom existing in a molecule, i.e. in a bonded state, is determined. In different molecules, an element’s valency remains constant while its oxidation state varies.

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