Question

zinc and mercury do not show variable valancy like d - block element because
a.they are soft
b.their d- shell are complete
c.they have only two electrons in the outermost subshell
d.their d- shell are incomplete​

Answer 1

Answer:

Zinc does not show the variable valency as elements of d-block, because d-orbital is full. Its outer electronic configuration is 3d  

10

4s  

2

.

So, they tend to lose only 2 electrons from their outermost shell. Hence, only show a valency of +2 and no variable valency.

Explanation:

Answer 2

Answer:

b. their d- shell are complete