Which one of the following statements is correct?

Asked in UPSC NDA 2 2015 · Topic: Nuclear Physics (Basic properties of nuclei: size, shape, charge, mass, spin, magnetic dipole and electric quadrupole moments.)

1. Rutherford’s alpha-particle scattering ex‐ periment 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 protons in the nucleus of its atom.
4. The mass number of an atom is equal to the number of electrons in its shells.

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