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[169] [170] On 7 October 2012, in celebration of Niels Bohr's 127th birthday, a Google Doodle depicting the Bohr model of the hydrogen atom appeared on Google's home page. [171] An asteroid, 3948 Bohr, was named after him, [172] as was the Bohr lunar crater and bohrium, the chemical element with atomic number 107. [173]
1913: Henry Moseley: defined atomic number; 1913: Niels Bohr: Model of the atom; 1915: Albert Einstein: theory of general relativity – also David Hilbert; 1915: Karl Schwarzschild: discovery of the Schwarzschild radius leading to the identification of black holes; 1918: Emmy Noether: Noether's theorem – conditions under which the ...
In atomic physics, the Bohr model or Rutherford–Bohr model was the first successful model of the atom. Developed from 1911 to 1918 by Niels Bohr and building on Ernest Rutherford 's nuclear model , it supplanted the plum pudding model of J J Thomson only to be replaced by the quantum atomic model in the 1920s.
Rutherford defined this position as being the element's atomic number. [75] [76] [77] In 1913, Henry Moseley measured the X-ray emissions of all the elements on the periodic table and found that the frequency of the X-ray emissions was a mathematical function of the element's atomic number and the charge of a hydrogen nucleus (see Moseley's law).
1935 Niels Bohr presents his analysis of the EPR paradox; 1936 Carl D. Anderson discovered the muon while he studied cosmic radiation; 1936 Alexandru Proca formulates the relativistic quantum field equations for a massive vector meson of spin-1 as a basis for nuclear forces; 1936 Eugene Wigner develops the theory of neutron absorption by atomic ...
Determination of the fundamental unit of electric charge makes it possible to calculate the Avogadro constant (which is the number of atoms or molecules in one mole of any substance) and thereby to determine the atomic weight of the atoms of each element. Niels Bohr publishes his 1913 paper of the Bohr model of the atom. [16]
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]
The Bohr–Sommerfeld model (also known as the Sommerfeld model or Bohr–Sommerfeld theory) was an extension of the Bohr model to allow elliptical orbits of electrons around an atomic nucleus. Bohr–Sommerfeld theory is named after Danish physicist Niels Bohr and German physicist Arnold Sommerfeld .