Which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon ?

Options

A. 3 s
B. `2 p`
C. 2 s
D. 1 s

Answer

D

Explanation

(d) Energy is emitted when electron falls from higher energy level to lower energy is absorbed when electron moves from lower level to higher level.
`1s` is the lowest energy level of electron in an atom.
`:.` An electron in `1 s` level of hydrogen can absorb energy but cannot emit energy.