Question

There are two or three valency showing i am not understand please show single valency of an element

Answer 1

hey mate! here is your answer

transition elements have more than one valency

for example the valency iron is 2 or three

eg.. feCl3 (here valency is 3).

FeSO4(here valency is 2)

here some special rules are applied besides basic rules

hope this will help you