Question

give reasons
a.in hydrogen chloride the valency of the element chlorine is considered as one.
b.certain metals exhibit more than one valency hence showing 'variable valency' 
 
need urgently

Answer 1

 (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

Answer 2

the answer in the up.is correct

Explanation:

mark me as brainlist