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  • Good morning class! Today we are going to discuss about the development of atomic structure.
  • "Matter is made up of small and hard particles called atomos."
  • It all began with a Greek philosopher named Democritus. He believed that...
  • "Atoms are tiny, invisible particles."
  • Then an English teacher named John Dalton created the first atomic theory.
  • "Atoms are made mostly of positively charged particles just like dough in a bun then the negatively charged particles are found inside the bun."
  • My atomic model is known as the "raisin bun model".
  • Then J.J. Thomson discovered electrons. He also proposed the existence of a positive particle.
  • My gold foil experiment proved the existence of a small massive center of an atom called the nucleus.
  • A guy named Ernest Rutherford discovered the protons and the nucleus.
  • I discovered particles with no charge. I decided to call these particles as neutrons.
  • James Chadwick discovered the neutrons.
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