The Wave-Particle Duality Theory Is the First Adequate Explanation of Which

Multiple Choice

The wave-particle duality theory is the first adequate explanation of which one of the following observations about the hydrogen atom?

A) The proton attracts the electron.
B) The proton forms the nucleus of the atom.
C) The electron orbits the proton.
D) The mass of the atom is less than the sum of the individual proton and electron masses.
E) The ground-state atom is stable to radiative collapse.