= Bohr model
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{title2=1913}
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Was the first model to explain the <Balmer series>, notably linking atomic spectra to the <Planck constant> and therefore to other initial <quantum mechanical> observations.
This was one of the first major models that just said:
\Q[I give up, I can't tie this to <classical physics> in any way, let's just roll with it, OK?]
It still treats <electrons> as little points spinning around the nucleus, but it makes the non-<classical physics>[classical] postulate that only certain angular momentums (and therefore energies) are allowed.
Bibliography:
* <Inward Bound by Abraham Pais (1988)> Chapter 9.e Atomic structure and spectral lines - Niels Bohr
* <The Quantum Story by Jim Baggott (2011)> Chapter 3 A Little Bit of Reality