Class 9 Chemistry Structure of The Atom Discovery of Proton

Discovery of Proton

  • The existence of protons in the atoms was given by Goldstein.
  • When electricity was passed at high voltage through a gas at a very low pressure in a discharge tube, streams of heavy particles were given at anode (positive electrode).These streams of particles are called as anode rays.
  • These particles were positively charged and the anode ray particles depend on the nature of the gas taken in the discharge tube.
  • Note: - The mass and charge of the anode ray particles depends on the nature of the gas taken in the discharge tube.
  • They are named as protons which are positively charged and it is found in all the atoms.
  • Protons are represented as p+.
  • Mass of proton is equal to the mass of hydrogen atom.
    • Therefore relative mass of proton is 1u.
    • Absolute mass of proton is 1840 times that of the electron.
  • Charge on electron is equal and opposite to the charge of the electron.
  • The charge on proton = 1.6 x 10-19
  • Relative charge is (+1) and the absolute mass of electron is 1.607 x 10-24


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