Question

name two elements that have variable valencies give the formula and name two compounds formed by each of these elements​

Answer 1

two elements having variable valencies:-

• iron(Fe)
• copper (Cu)

compounds formed by those two:-

• iron:-

1. ferrous sulphate (FeSO4)
2. ferrous oxide(FeO)

• copper:-

1. cupric oxide(CuO)
2. copper sulphate (CuSO4)

hope this helps you.....