Question detail
Why do electrons contribute little to an atom’s mass?
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. They are far from the nucleus
- B. They have very small mass compared to protons and neutrons
- C. They are positively charged
- D. They are in higher energy levels
Answer
The correct answer is B: They have very small mass compared to protons and neutrons.
Explanation
The correct answer is B: They have very small mass compared to protons and neutrons. This supports the learning objective "State that nearly all the mass of an atom is concentrated in the nucleus." in The structure of an 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 structure of an atom idea: They are far from the nucleus; They are positively charged; They are in higher energy levels.
Common mistake
Mass Concentration Misunderstanding
Students often think that the mass of an atom is evenly distributed throughout the atom rather than concentrated in the nucleus.
Emphasize that nearly all the mass of an atom is concentrated in the nucleus, which contains protons and neutrons, while electrons have negligible mass.
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