Question

answer tis please..!

Answer 1

1. Element A is a metal as it's in 1 st group I.e. has valency 1

2. Element B has larger atomic size than c as the atomic size decreases along a period

3. Element C has a valency 1 as it's electronic configuration is 2, 7 as it is present in 17th group and 2nd period (no. of period = no. of shells)

Hope this helps u