Question

certian metals have variable valency why​

Answer 1

Answer:

Some elements show variable valency because of the different electronic configurations. An atom of an element can sometimes lose more electrons than are present in its valence shell i.e. loss from the penultimate shell and hence exhibit more than 1 or variable valency. ... This is termed variable valence

Answer 2

metals have variable valency bcz all the metals are electron donor...