Question

In potassium the probable order of energy level for 19th electron is :-
(1) 3s > 3d
(2) 4s < 3d
(3) 4s > 4p​

Answer 1

hey mate here is your answer

potassium has a configuration of

1s2,2s2,2p6,3s2,3p6,4s1

so the answer is

(2) 4s< 3d

hope it helps