SCIENCE: THE ATOMIC THEORY

Cards (13)

  • atom is considered the smallest particle of matter
  • Atomic model is a representation of what an atom could look based on observations and scientific evidence that describe how atoms behave
  • Democritus expressed his belief that matter consists of very small, indivisible objects, which then he described as atomos
  • Aristotle believed that matter was made up of four natural elements
  • John Dalton, an English physicist, proposed the first atomic theory after conducting a number of experiments about atoms, which he wrote in his book A New System of Chemical Philosophy. He viewed atoms as solid spheres, which he believed had four characteristics.
  • A subatomic particle is a particle smaller than an atom in which scientists used experimental observations to establish its existence.
  • Joseph John Thomson was able to discover electrons from his observations in his cathode ray tube experiment
  • A cathode ray tube is a glass tubing with two electrodes, namely, the anode (+) and the cathode (-), at each end.
  • Plum Pudding Model : chocolate-chip cookie model
  • Robert Millikan : oil drop experiment
  • Ernest Rutherford : gold foil experiment
  • Niels Bohr : planetary model
  • James Chadwick : Neutrons