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Question

Rutherford’s scattering experiment is related to the size of the


A

Electron

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B

Atom

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C

Nucleus

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D

Nucleons

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Solution

The correct option is C

Nucleus


Explanation for correct option:

Option C

Rutherford's model of an atom:

  • Rutherford’s α-particle scattering experiment led to the discovery of the atomic nucleus.
  • The positively charged particles and most of the mass of an atom were concentrated in a small volume.
  • He called this region of the atom a nucleus.
  • The Rutherford model proposed that the negatively charged electrons surround the nucleus of an atom. He also said that the electrons surrounding the nucleus revolve around it at a very high speed in circular paths.
  • He named these circular paths orbits.
  • Electrons being negatively charged and nucleus being a densely concentrated mass of positively charged particles are held together by a strong electrostatic force of attraction.

Therefore, option C is correct.

Explanation for the incorrect option:

Option A

Electrons are negatively charged particles that revolve around the nucleus in a circular path called an orbit.

  • Electron was discovered by J.J Thomson.

Therefore, option A is incorrect.

Option B

  • An atom is the smallest particle that retains the properties of an element.
  • An atom consists of fundamental particles or subatomic particles called electron, proton and neutron.
  • An atom is neutral in nature.

Therefore, option C is incorrect.

Option D

  • Protons and neutrons are combinedly called nucleons.
  • They are present in the nucleus.

Therefore, option D is incorrect.


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