Valency can be defined as the combining capacity of the elements.the electrons present in the outermost shell of an atom is known as valence shell and they determine the valency.the valence electron take part in chemical reaction and they determine the chemical properties of the elements.let us take an example ,
the atomic no: of carbon is 6
its configuration = 2,4  it means valency is 4.
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the combining power of an element, especially as measured by the number of hydrogen atoms it can displace or combine with.Or in general it no. of electrons in outermost shell.
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Valency of an element is the measure of its combining power with other atoms.