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Niels Henrik David Bohr, Bohr's Atomic Model (Born: October 7, 1885 - Died: November 18,1962)
Niels Bohr discovered that electrons travel in separate orbits around the nucleus, that the number of electrons in the outer orbit determines the properties of an element, and that the electrons in the outer orbital rings contain more energy than the ones in the inner rings. This led to more discoveries in science.
Bohr, Niels. “On the Constitution of Atoms and Molecules.” Philosophy Magazine, July 1913, pp. 1–24.
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Niels Henrik David Bohr, Correspondence Principle (Born: October 7, 1885 - Died: November 18,1962)
Bohr's Correspondence Principle is described as quantum mechanics cannot work without classical theories such as Newtonian mechanics. Correspondence Principle is mentioned in his writing in 1913 but was not fully coined until 1923.
Bohr, Niels. “On the Constitution of Atoms and Molecules.” Philosophy Magazine, July 1913, pp. 1–24.
https://youtu.be/5NPEm0nabRY -
Niels Henrik David Bohr, Complementarity Principle (Born: October 7, 1885 - Died: November 18,1962)
Bohr's Complementarity Principle states that we can not observe both wave and particles at the same time. Meaning that as someone is experimenting something, they are not see every aspect of the experiment.
Bohr, Niels. “The Quantum Postulate and the Recent Development of Atomic Theory.” Nature, 14 Apr. 1928, pp. 580–590. -
Niels Henrik David Bohr, "Free Choice" (Born: October 7, 1885 - Died: November 18,1962)
Since Bohr stated that we can't see both wave and particles at the same time he came up with the "freedom of choice," where the experimenter has the freedom to choose which to measure in quantum physics, this also applies to physical reality. This was in response to Einstein's challenge to the "completeness" of quantum mechanics.
Bohr, Niels. “Causality and Complementarity.” Philosophy of Science, vol. 4, no. 3, July 1937, pp. 289–298., doi:10.1086/286465.
