Answer :

The probability cloud of the electron in a hydrogen atom relate to the orbit described by niels bohr will be The average separation between the cloud and the nucleus is almost equal to the radius of such Bohr orbit.

When explaining the line spectrum of both the hydrogen atom, Niels Bohr made the assumption that the electron traveled in circular orbits which meant that only orbits with specific radii were permitted.

The electrons that are closest to the nucleus would make an effort to get as close as they can. The inner electrons will act as a shield for the outer/valence electrons, which are farther from the nucleus. The outside electrons cannot establish a strong attraction towards the nucleus because of the inner electrons.

Therefore, the average separation between the cloud and the nucleus is almost equal to the radius of such Bohr orbit.

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