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  • Atomic History 
  • Democritus 400 BC The matters of atoms 
  • Atomic History
  • My name is John. John Dalton
  • Atomic History
  • My name is JJ Thomson. The one who discovered ELECTRONS
  • Democritus's theory was that all matter was made up up of tiny particles called ATOMS. He called these particles 'Atoms' or 'Atomos', which in Greek meaning 'Invisible'.
  • Atomic History
  • Ernest Rutherford is the name for me.
  • John Dalton developed an atomic theory in the 1800s. He said 'All matter is made from atoms. Atoms cannot be broken down into anything simpler. All the atoms of a particular element are identical to each other and different from the atoms of another elements. Atoms are rearranged in a chemical reaction.
  • Atomic History
  • JJ Thomson discovered the electron in 1897. He used a model called the plum pudding model. The cake part he thought of as positively charged. The pieces of fruit he thought of as negatively charged particles.This showed that the atoms contained smaller pieces, whereas Dalton had thought that atoms could not be broken down into anything simpler.
  • Atomic History
  • Who are you?
  • Ernest Rutherford used experimental evidence to show that an atom must contain a central positively charged nucleus. This was further evidence that an atom contained smaller pieces. He proved that each atom had a small nucleus with electrons orbiting the nucleus.
  • Niels Bohr developed Rutherford’s nuclear atom model. He used experimental evidence to support the idea that electrons occupy particular orbits or shells around the nucleus of an atom. This model of the atom is sometimes referred to as the Bohr model of the atom.
  • Neils Bohr
  • James Chadwick devised a clear experiment to prove the existence that the nucleus contained particles called neutrons, as well as positively charged protons. Neutrons had no electric charge and a mass about the same as a proton.
  • The name is James Chadwick
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