Chemistry – Atomic Structure

1. How many neutrons are present in an atom with an atomic number of 35 and a mass number of 80?

  1. 35
  2. 45
  3. 80
  4. 115
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Answer: Option B. 45

2. What is the name of the region around the nucleus where electrons are most likely to be found?

  1. Proton zone
  2. Neutron field
  3. Photon cloud
  4. Atomic orbital
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Answer: Option D. Atomic orbital

3. Which was the first fundamental particle to be discovered?

  1. Electron
  2. Proton
  3. Neutron
  4. Photon
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Answer: Option A. Electron

4. Which of the following does not indicate the Atomic number of an atom?

  1. Number of protons
  2. Number of electrons in a neutral atom
  3. Number of neutrons in the nucleus
  4. Position in the periodic table
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Answer: Option C. Number of neutrons in the nucleus

5. Which of the following was discovered during Millikan’s oil drop experiment?

  1. Charge of the electron
  2. Mass of the proton
  3. Structure of the atom
  4. Existence of neutrons
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Answer: Option A. Charge of the electron