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NEET UG Structure of the Atom — practice questions

Explore 10 free Structure of the Atom questions in NEET UG Science. Open each question or exercise to read its content, reference answers and available explanation.

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Structure of the Atom questions and exercises with answers

Showing questions 1–10 of 10.

In Rutherford's atomic model, electrons revolve around the nucleus due to:Read the answer and worked solution →A key failure of Rutherford's classical model was that an accelerating electron should:Read the answer and worked solution →In Bohr's model of the hydrogen atom, electrons can only occupy orbits in which the angular momentum is an integer multiple of:Read the answer and worked solution →The radius of the n-th Bohr orbit for hydrogen is proportional to:Read the answer and worked solution →The Bohr radius a_0 is approximately:Read the answer and worked solution →In Bohr's model, the energy of the n-th level of hydrogen is:Read the answer and worked solution →The ground-state (n = 1) energy of the hydrogen atom is approximately:Read the answer and worked solution →The energy of the first excited state (n = 2) of hydrogen is:Read the answer and worked solution →The ionisation energy of hydrogen from its ground state is approximately:Read the answer and worked solution →When a hydrogen atom makes a transition from n = 2 to n = 1, the energy of the emitted photon is approximately:Read the answer and worked solution →

Worked practice questions

In Rutherford's atomic model, electrons revolve around the nucleus due to:

  1. gravitational force
  2. nuclear strong force
  3. Coulomb (electrostatic) attraction
  4. magnetic force
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Correct answer: C. Coulomb (electrostatic) attraction

Coulomb force between negative electron and positive nucleus.

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A key failure of Rutherford's classical model was that an accelerating electron should:

  1. spiral into the nucleus radiating energy
  2. emit X-rays
  3. acquire infinite mass
  4. become a positron
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Correct answer: A. spiral into the nucleus radiating energy

Classical EM predicts continuous radiation and orbital decay.

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In Bohr's model of the hydrogen atom, electrons can only occupy orbits in which the angular momentum is an integer multiple of:

  1. h
  2. πh
  3. (h/2π)²
  4. h/(2π)
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Correct answer: D. h/(2π)

mvr = n ħ = n h/(2π).

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