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  • According to Democritus' atomic theory, the universe and all matter obey the following principles: Everything is composed of “atoms”, which are physically, but not geometrically, indivisible.
  • John Dalton developed an atomic theory in the 1800s. He did experiments, worked out some atomic weights and invented symbols for atoms and molecules.
  • JJ Thompson was the person who introduced the plum pudding model. That is atoms are composite objects, made of pieces with positive and negative charge, and that the negatively charged electrons within the atom were very small compared to the entire atom.
  • Rutherford's new model for the atom, based on the experimental results, contained the new features of a relatively high central charge concentrated into a very small volume in comparison to the rest of the atom and with this central volume also containing the bulk of the atomic mass of the atom. 
  • In order to explain the stability of an atom, Neils Bohr gave a new arrangement of electrons in the atom in 1913. 
  •  The electron does not radiate energy (lose energy).
  • According to Neils Bohr, the electrons could revolve around the nucleus in only 'certain orbits' (energy levels), each orbit having a different radius.   
  • Even though it has accelerated motion around the nucleus.
  • When an electron is revolving in a particular orbit or particular energy level around the nucleus,
  • In 1926 Erwin Schrödinger, an Austrian physicist, took theBohr atom model one step further. Schrödinger used mathematical equations to describe the likelihood of finding an electron in a certain position. This atomic model is known as the quantum mechanical model of the atom.
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