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  4. Assertion: Electrons in the atom are held due to coulomb forces. Reason: The atom is stable only because the centripetal force due to Coulomb’s law is balanced by the centrifugal force.

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Q. Assertion : Electrons in the atom are held due to coulomb forces.
Reason : The atom is stable only because the centripetal force due to Coulomb’s law is balanced by the centrifugal force.

AIIMSAIIMS 2016Atoms

Solution:

Assertion is true but reason is false. According to postulates of Bohr’s atom model, the electron revolve round the nucleus in fixed orbit of definite radii. As long as the electron is in a certain orbits it does not radiate any energy. Not only the centripetal force has to be the centrifugal force, even the stable orbits are fixed by Bohr’s theory.

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