GC Atomic Structure

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

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

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 D.