What are the valencies of cuprous and cupric and ferrous and ferric
Some elements like copper and iron exhibits more than one valency. That is they have variable valencies.
Generally the name of the element end in ‘ous’ for lower valency and end in ‘ic’ for higher valency.
The valency of cuprous is 1 and the valency of cupric is 2.
The valency of ferrous is 2 and the valency of ferric is 3.