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Zn and Hg do not show variable valency l...

`Zn` and `Hg` do not show variable valency like `d-`block elements because-

A

They are soft

B

Their `d-`shell are complete

C

They have only two electrons in the outermost subshell

D

Their `d-`shells are incomplete

Text Solution

Verified by Experts

`Zn` and `Hg` do not show variable valency like `d-`block elements because their `d-`shell are complete their electronic confign are
`{:(Zn^(30),3d^(10).4s^(2)),(Hg^(48),4d^(10).5s^(2)):}`
The variable valency is shown by those elements which have got incompletely filled `'d'` orbitals
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