Which One of The Following Statements is Correct?

  1. Rutherford’s alpha-particle scattering experiment led to the discovery of electron.
  2. J J Thomson suggested that the nucleus of an atom contains protons.
  3. The atomic number of an element is the same as the number of electrons in its shells
  4. The mass number of an atom is equal to the number of electrons in tis shells
Anurag Mishra Professor Asked on 29th September 2015 in Science.
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