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Which of the following statements are correct or incorrect according to the Bohr’s atomic model? Give a reason for each statement. (i) Electrons lose energy while moving in fixed orbits and slowly fall into the nucleus. (ii) Electrons can exist anywhere around the nucleus with no fixed energy. (iii) Electrons revolve around the nucleus in orbits of fixed energy without losing energy. (iv) Electrons can be found between energy levels as they move around the nucleus.
View Answer
- (i) Incorrect — in Bohr’s model, electrons in fixed orbits do not lose energy, so they do not fall in.
- (ii) Incorrect — electrons cannot exist anywhere; they have only fixed, definite energies .
- (iii) Correct — electrons revolve in orbits of fixed energy without losing energy.
- (iv) Incorrect — electrons cannot be found between energy levels.
Statement (Bohr’s model)
Verdict & reason
(i)
Electrons lose energy while moving in fixed orbits and slowly fall into the nucleus.
Incorrect
— in a
stationary state
an electron does not lose energy, so it never falls in.
(ii)
Electrons can exist anywhere around the nucleus with no fixed energy.
Incorrect
— electrons exist only in
allowed shells
, each with a definite energy.
(iii)
Electrons revolve around the nucleus in orbits of fixed energy without losing energy.
Correct
— this is exactly Bohr’s postulate of stationary states.
(iv)
Electrons can be found between energy levels as they move around the nucleus.
Incorrect
— electrons revolve
only
in the allowed shells, never in between them.
