Which is the correct electronic configuration of chlorine

• GC Atomic Structure

Which one of the following is the correct electronic configuration of chlorine

1. 7, 8, 2
2. 2, 8, 7
3. 2, 8, 8
4. 2, 7, 8

Answer

Atomic number of chlorine is 17. K shell has 2 electrons, L shell has 8 electrons and remaining 7 electrons are in M shell.

The correct option is B.