Worldwide helium shortage threatens more than just balloons

If an electron in helium is excited to the n=4 level, how many unique emission lines will be seen in the emission spectrum? Show your reasoning using an appropriate diagram. [3]

The maximum number of emission lines obtained when an excited e... | Filo

The series of emission lines of the hydrogen atom for which n1... | Filo

Jeonginology - I just can't laughing about I.N's cute...

Charles Barkley tells cast 'I hate y'all' as fans label his voice 'the greatest'