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  2. Bohr model - Wikipedia

    en.wikipedia.org/wiki/Bohr_model

    II:106 Although Bohr's model would also rely on just the electron to explain the spectrum, he did not assume an electrodynamical model for the atom. The other important advance in the understanding of atomic spectra was the Rydberg–Ritz combination principle which related atomic spectral line frequencies to differences between 'terms ...

  3. Bohr–Sommerfeld model - Wikipedia

    en.wikipedia.org/wiki/Bohr–Sommerfeld_model

    The theory would have correctly explained the Zeeman effect, except for the issue of electron spin. Sommerfeld's model was much closer to the modern quantum mechanical picture than Bohr's. In the 1950s Joseph Keller updated Bohr–Sommerfeld quantization using Einstein's interpretation of 1917, [6] now known as Einstein–Brillouin–Keller method.

  4. List of theorems - Wikipedia

    en.wikipedia.org/wiki/List_of_theorems

    Bohr–Mollerup theorem (gamma function) Bohr–van Leeuwen theorem ; Bolyai–Gerwien theorem (discrete geometry) Bolzano's theorem (real analysis, calculus) Bolzano–Weierstrass theorem (real analysis, calculus) Bombieri's theorem (number theory) Bombieri–Friedlander–Iwaniec theorem (number theory) Bondareva–Shapley theorem

  5. Complementarity (physics) - Wikipedia

    en.wikipedia.org/wiki/Complementarity_(physics)

    In physics, complementarity is a conceptual aspect of quantum mechanics that Niels Bohr regarded as an essential feature of the theory. [1] [2] The complementarity principle holds that certain pairs of complementary properties cannot all be observed or measured simultaneously.

  6. History of quantum mechanics - Wikipedia

    en.wikipedia.org/wiki/History_of_quantum_mechanics

    Niels Bohr's 1913 quantum model of the hydrogen atom. In 1913 Niels Bohr proposed a new model of the atom that included quantized electron orbits: electrons still orbit the nucleus much as planets orbit around the Sun, but they are permitted to inhabit only certain orbits, not to orbit at any arbitrary distance. [18]

  7. 9 two-week-old puppies found abandoned in bucket on New ...

    www.aol.com/news/9-puppies-found-abandoned...

    A litter of two-week old puppies was crammed into a bucket and abandoned alongside a road in Union County, New Jersey on Thursday, police said. The nine puppies were found inside a five-gallon ...

  8. 15 Foods You Should Buy When They're on Sale - AOL

    www.aol.com/15-foods-buy-theyre-sale-200000635.html

    Groceries are eating up more than just your time — about $270 per week for the average American household. That’s $1,080 a month or a gut-punching $14,051 a year. Yikes. But before you start ...

  9. History of chemistry - Wikipedia

    en.wikipedia.org/wiki/History_of_chemistry

    In 1913, Niels Bohr, a Danish physicist, introduced the concepts of quantum mechanics to atomic structure by proposing what is now known as the Bohr model of the atom, where electrons exist only in strictly defined circular orbits around the nucleus similar to rungs on a ladder. The Bohr Model is a planetary model in which the negatively ...