Question detail
In the context of the atomic model, what does the term 'nucleus' refer to?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Atoms and isotopes
Question
- A. The outer shell of an atom
- B. The positively charged center of an atom
- C. The negatively charged particles surrounding the atom
- D. The total mass of an atom
Answer
The correct answer is B: The positively charged center of an atom.
Explanation
The correct answer is B: The positively charged center of an atom. This supports the learning objective "Explain why some alpha particles being deflected suggested that positive charge is concentrated in a small nucleus." in The development of the model of the atom because it uses the correct atomic and nuclear radiation relationship for Atoms and isotopes. The other options are less suitable because they do not match the required The development of the model of the atom idea: The outer shell of an atom; The negatively charged particles surrounding the atom; The total mass of an atom.
Common mistake
Misunderstanding Alpha Particle Deflection
Students often think that all alpha particles should be deflected by the nucleus, leading them to believe that the nucleus is large and occupies most of the atom's volume.
Emphasize that only a small fraction of alpha particles are deflected, indicating that the nucleus is small and dense, while most of the atom is empty space.
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