Which one of the following is considered as the main postulate of Bohr’s model of atom?

  • A
    Protons are present in the nucleus
  • B
    Electrons are revolving around the nucleus
  • C
    Centrifugal force produced due to the revolving electrons balances the force of attraction between the electron and the protons
  • D
    Angular momentum of electron is an integral multiple of $\frac{h}{2\pi}$

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