Question

Give two examples for each of the following:
a) Acid radicals
b) Molecules of element
c) Elements with variable valency
d) Element with valency 4
e) Triatomic molecules​

Answer 1

1. SO42, NO3
2. hydrogen (H2), oxygen (O2)
3. cuprous oxide (Cu2O), cupric oxide (CuO).
4. Carbon,Silicon
5. H2O, CO2