How the model of an atom develped

How the model of an atom develped

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  • Dalton's model of an atom: John Dalton proposed that all matter is composed of very small things which he called atoms. When Dalton proposed his model electrons and the nucleus were unknown.
  • Thomson's model of an atom:Thomson played with cathode rays. These are just beams of electrons. By having the beam interact with electric and magnetic fields, Thomson was able to determine the mass to charge ratio for an electron. He knew that the electron came from the atom, it had a negative charge and a small mass.
  • Electrons
  • Positive stuff
  • Rutherford's model of an atom: Rutherford carried out some experiments which led to a change in ideas around the atom. His new model described the atom as a tiny, dense, positively charged core called a nucleus surrounded by lighter, negatively charged electrons.
  • Electrons orbiting the Nucleus
  • Nucleus
  • Niels Bohr that by proposing that the electrons could only orbit the nucleus in certain special orbits at different energy levels around the nucleus.
  • Nucleus
  • Electron orbit
  • Rutherford predicted (in 1920) that another kind of particle must be present in the nucleus along with the proton. He predicted this because if there were only positively charged protons in the nucleus, then it should break into bits because of the repulsive forces between the like-charged protons!In 1932 James Chadwick discovered the neutron and measured its mass.
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