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  • John Dalton (1804) J.J Thompson (1904
  • NO. atoms cannot be destroyed
  • Ernest Rutheford(1909) Niels Bohr (1926)
  • Quantum Model (modern Model) 1926
  • John Dalton Experimented with gases that first became possible, at the turn of the nineteenth century led John Dalton in 1803 to propose a modern theory of the atom. Atoms Cannot be created, destroyed, and divided. J.J Thompson took science to new heights with his 1897 discovery of the electron, the first subatomic particle. As the cathode rays carry a charge of negative electricity, are deflected by an electrostatic force as if they were negatively electrified, and are acted on by a magnetic force
  • In 1912 Bohr joined Rutherford. He realized that Rutherford's model wasn't quite right. By all rules of classical physics, it should be very unstable. For one thing, the orbiting electrons should give off energy and eventually spiral down into the nucleus, making the atom collapse. Or the electrons could be knocked out of position if a charged particle passed by. Bohr turned to Planck's quantum theory to explain the stability of most atoms. He found that the ratio of energy in electrons and the frequency of their orbits around the nucleus was equal to Planck's constant
  • The quantum model of the atom uses four quantum numbers to describe the arrangement of electrons in an atom, much like an address describes the locations of houses on a street. This arrangement is known as the electron configuration. The atoms for each element have their own distinct electron configuration.
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