Final answer:
Of the given options, 3g¹¹ cannot exist as an orbital. The subshell 'g' violates the rules of electron configuration.
Step-by-step explanation:
Of the given options, 3g¹¹ cannot exist as an orbital. The subshell 'g' does not exist in the electron configuration because it violates the rules of electron configuration. The letters s, p, d, and f are the only valid subshells. The subshell 'g' violates the convention of using letters from the beginning of the alphabet to represent subshells.