Question

Zinc and mercury do not show variable valency like d-block elements because.

• A. They are soft
• B. Their d- shells are complete
• C. They have only two electrons in the outermost subshell
• D. Their d-shells are incomplete

Answer 1

Answer: (B)

Their d- shells are complete

Answer 2

$30Zn$ and $80Hg$ have their d orbitals completely filled so they do not show any variable valency.