Physics Pioneers Balmer,Rydberg,and Ritz Discovered in Atomic Spectra

Physics pioneers Balmer,Rydberg,and Ritz discovered in atomic spectra

A) a randomness that opened the door to the nature of probabilities in atomic reality.
B) mathematical order.
C) that all atoms are essentially the same size.
D) that electrons occupy well-defined shells about the atomic nucleus.
E) that electrons behave as standing waves.