Question

1. Identify the elements from the
following atomic number and write,
a) to which period does they belongs
to. b) to which group does they
belongs to? c) write their valancy
A-8
B-11
C-12
D-17​

Answer 1

Explanation:

Chlorine has atomic number 17.Electronic Configuration - 1s 2 2s 2 2p 6 3s 2 3p 5 .Period Number - 3Group number - VII (A) or 17Element Family