Explain question number 100

option D is correct bec energy order in hydrogen atoms is 1s<2s=2p<3s=3p=3d<4s=4p......and so on

option D 1s<2s=2p<3s=3p=3d<4s. Energy levels for H

option D https://www.google.com/amp/s/amp.doubtnut.com/question-answer-chemistry/in-a-hydrogen-atom-which-orbital-is-higher-in-energy-than-a-3s-orbital-17242101

A hydrogen atom has only one electron, that experiences no shielding from other electrons, and therefore its energy level only depends on its distance away from the nucleus, which ...