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

Multiple Choice

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

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