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### Why can't an energy level exist containing 0.9 electron wave wavelengths? Why must it be a whole number? [duplicate]

So, I was reading Atom: Journey Across The Subatomic Cosmos by Isaac Asimov in order to better understand quantum mechanics when I came across this sentence: The electron couldn't spiral into the ...
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### Why do we rule out orbits with non-constructive interference for the atom? [duplicate]

It is said that de Broglie explained the quantization of Bohr's orbitals with the idea of the "matter wave" of the electron being forced to have orbits where it can interfere constructively ...