Answers

2015-06-19T15:29:30+05:30
 (a)    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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