Which of the transitions in the hydrogen atom energy-level diagram shown here is not possible?
A) a
B) b
C) c
D) d

Question

Which of the transitions in the hydrogen atom energy-level diagram shown here is not possible? 
A) a 
B) b 
C) c 
D) d

Quizplus · Accepted Answer

Transition d corresponds to an electron jumping from energy level 2 to energy level 4. This is not possible because it violates the principle of conservation of energy, as the electron would have to gain more energy than is available in the system. All other transitions shown are possible and correspond to the emission or absorption of energy by the hydrogen atom.

Which of the Transitions in the Hydrogen Atom Energy-Level Diagram