Question detail
Which part of an atom contains almost all of its 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. The electron cloud
- B. The nucleus
- C. The atomic shell
- D. The outermost energy level
Answer
The nucleus
Explanation
The nucleus, made of protons and neutrons, holds nearly all the mass of an atom, while the electrons are extremely light.
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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