What is the theoretical maximum number of electrons in the n = 5 energy level?

50 is the theoretical maximum number of electrons in the N = 5 energy level.

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts

27. =3,500,000 x 4,000 = 14,000,000,000