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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If the radius of the second Bohr orbit of the $He^{+}$ ion is $105.8 \, pm$, what is the radius of the third Bohr orbit of the $Li^{2+}$ ion?

What is the ratio of time periods $(T_1 / T_2)$ in the second orbit of a hydrogen atom to the third orbit of a $He^{+}$ ion?

Which formula is used to calculate the energy of a species containing $1$ electron?

The light of wavelength $242 \, nm$ is required to remove an electron from a $Na$ atom. What is the ionization energy of the sodium atom in $kJ \, mol^{-1}$?

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The energy of the electron in the first orbit of $He^{+}$ is $-871.6 \times 10^{-20} \ J$. The energy of the electron in the first orbit of hydrogen would be

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