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  2. Bohr model - Wikipedia

    en.wikipedia.org/wiki/Bohr_model

    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.

  3. File:Stylised atom with three Bohr model orbits and stylised ...

    en.wikipedia.org/wiki/File:Stylised_Lithium_Atom.svg

    * Removed light shadows at the upper right of particles. * Smoothed out electron orbitals into real ellipses. * Made electrons smaller than nuclei. * Changed colors to the more usual blue for electrons, red for protons, and dark gray for neutrons. 07:58, 18 March 2007: 270 × 305 (10 KB) Indolences: edited inkscape svg by hand; file size cut in ...

  4. Electron shell - Wikipedia

    en.wikipedia.org/wiki/Electron_shell

    In 1913, Niels Bohr proposed a model of the atom, giving the arrangement of electrons in their sequential orbits. At that time, Bohr allowed the capacity of the inner orbit of the atom to increase to eight electrons as the atoms got larger, and "in the scheme given below the number of electrons in this [outer] ring is arbitrary put equal to the normal valency of the corresponding element".

  5. Discovery of the neutron - Wikipedia

    en.wikipedia.org/wiki/Discovery_of_the_neutron

    A schematic of the nucleus of an atom indicating β − radiation, the emission of a fast electron from the nucleus (the accompanying antineutrino is omitted). In the Rutherford model for the nucleus, a red sphere was a proton with positive charge, and a blue sphere was a proton tightly bound to an electron, with no net charge.

  6. File:Bohr atom model English.svg - Wikipedia

    en.wikipedia.org/wiki/File:Bohr_atom_model...

    Bahasa Melayu: Model Bohr dari atom hidrogen menggambarkan elektron-elektron bermuatan negatif mengorbit pada kulit atom dalam lintasan tertentu mengelilingi inti atom yang bermuatan positif. Ketika elektron meloncat dari satu orbit ke orbit lainnya selalu disertai dengan pemancaran atau penyerapan sejumlah energi elektromagnetik hf.

  7. File:Niels Bohr - LOC - ggbain - 35303.jpg - Wikipedia

    en.wikipedia.org/wiki/File:Niels_Bohr_-_LOC...

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  9. Extended periodic table - Wikipedia

    en.wikipedia.org/wiki/Extended_periodic_table

    The Bohr model exhibits difficulty for atoms with atomic number greater than 137, for the speed of an electron in a 1s electron orbital, v, is given by v = Z α c ≈ Z c 137.04 {\displaystyle v=Z\alpha c\approx {\frac {Zc}{137.04}}}