Question

write the symbol of two metals that have variable valencies​

Answer 1

The valence is known as an element's combining power. Some elements vary in their ability to interact with other elements, depending on the nature of the reaction; variable valence is called this property. Iron (Fe), for example, may have a valence of both 2 and 3.

Answer 2

fe2+ fe3+

Explanation:

an atom can lose sometimes more electrons than present in it's valance shell i.e. loss from the penultimate shell. Thus exhibits variable valency