Phenomena/Features that imply the quantized nature of the electrons in an atom
The Attempt at a Solution
Electrons can take only certain allowed energy values. when an electron moves from a high energy level to a lower level, a photon is emitted by the electron. the photon carries away the energy lost by the electron. since the electron is only allowed certain energy values, the photon can only have certain energy values.
This is what I have so far (and if i'm on the right path)? i would like to know if there is any other phenomena/features that imply the quantized nature of electron in an atom