MCQ
Which of the following options does not represent ground state electronic configuration of an atom
- A$ \ce{1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^8 4 s^2} $
- ✓$ \ce{1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^9 4 s^2} $
- C$ \ce{1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^{10} 4 s^1} $
- D$\ce{1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 3 d^5 4 s^1} $
