Which is an IMPOSSIBLE electron configuration?

Question

Quizplus · Accepted Answer

The notation used in the options does not follow the standard electron configuration notation, which typically uses numbers to indicate energy levels and letters (s, p, d, f) to indicate subshells, followed by superscripts to show the number of electrons in those subshells. Option C is impossible because it uses a non-standard and nonsensical notation that doesn't correspond to any known electron configuration format.

Which Is an IMPOSSIBLE Electron Configuration