Valence electron and corelectron
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Explanation:
The valency of an element is a measure of its combining capacity and can be defined as
the number of electrons that must be lost or gained by an atom to obtain a stable electron configuration.
What does the term ‘Oxidation State’ mean?
The oxidation state of an atom is the number of electrons lost or gained by it.
Oxidation State and valency are one of the most fundamental properties of elements and can be studied with the help of electron configurations.
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