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Q.

The energy  of the electron  in a hydrogen  atom has a negative sign  for all possible orbits because

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a

when  the electron  is attracted  by the nucleus and  is present  in orbit n, the energy  is emitted and its energy is lowered

b

when the electron  is attracted  by the nucleus and is present in orbit n, the energy is absorbed and its energy is increased

c

when the electron  is repelled  by the nucleus, the energy  is released  and its energy is lowered

d

none of these

answer is A.

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Detailed Solution

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 The energy of the electron in the atom is lower than the energy of a free electron at rest i.e. 0, that it is infinitely far away from the nucleus and has negligible attraction towards nucleus. As the electron gets closer to the nucleus attraction increases and thus lower the energy of the system by releasing energy that has negative magnitude.

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The energy  of the electron  in a hydrogen  atom has a negative sign  for all possible orbits because