Bohr modified the ___________ by adding that the electrons move in orbits of fixed size and energy.

Rutherford's model

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Dalton's model

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Thomson's model

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Goldstein's model

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Solution

The correct option is A Rutherford's model
Bohr modified the Rutherford model by adding that the electrons move in orbits of fixed size and energy. Electrons revolve around the nucleus in concentric circular orbits at fixed distance from the nucleus.
These are stationary orbits and the energy of electrons in these orbits is constant.

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