Question

Difference between nuclear fission and fusion.. Difference between 1st and 17th group... Explain extraction of copper... Plz answer me three of these questions

Answer 1

see in class 10 ncert book

Answer 2

fusion is a reaction in which the particles fuse whereas in fission the particles bond breaks.
in group 1 the valency of substances is 1 but in group 17 it is 7.