One atom of hydrogen combines with one atom of chlorine and so the valency of chlorine is ___.

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Solution

Valency is the combining tendency of an element or radical.
It is the number of electrons lost or gained by an atom of an element in order to complete its octet and attain stability.
It is the number of hydrogen atoms that will combine with or displace one atom of that element. The valency of hydrogen is one.
Thus one atom of hydrogen combines with one atom of chlorine and so the valency of chlorine is 1.

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