The Nucleus Quiz
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5 questions, one answer each
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1. What is the relative charge of a neutron?
- A. +1
- B. 0
- C. −1
- D. +2
2. What does the proton number (Z) of an atom tell you?
- A. The total number of protons and neutrons
- B. The number of protons in the nucleus
- C. The number of electrons orbiting outside the nucleus in an ion
- D. The mass of the atom in kilograms
3. An atom loses two electrons. What has it become?
- A. A negative ion
- B. A positive ion
- C. A different isotope
- D. A neutron
4. In an alpha particle scattering experiment, a small number of alpha particles bounce almost straight back from a thin gold foil. What does this specific observation show about the atom's structure?
- A. The atom has no nucleus at all
- B. The nucleus is very small and dense, and carries a positive charge that strongly repels the positive alpha particles
- C. The whole atom is uniformly positively charged, as in the plum pudding model
- D. The gold foil must be several atoms thick, blocking the particles by simple collision
5. Two atoms of the same element have proton number 17, but one has nucleon number 35 and the other has nucleon number 37. What term describes their relationship, and how many neutrons does each have?
- A. Isotopes; 18 and 20 neutrons respectively
- B. Ions; 35 and 37 neutrons respectively
- C. Isotopes; 17 and 17 neutrons respectively
- D. Different elements; 18 and 20 neutrons respectively