In hcl the valency of the element chlorine is considered as one give reason
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hydrogen has 1 electron & chlorine has 7 electrons in its valence shell
hydrogen removes 1 electron & gets stabilised whereas chlorine accepts the ejected electron from hydrogen atom & achieves the octet to get stabilised in hydrogen chloride molecule . as chlorine accepts 1 electron so valency of it is 1
(b) the metals which shows more than one valency are generally transition metals . the transition metals have incompletely filled d orbitals . so they exhibit variable valencies
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