Exam-style question
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What implication does the discovery of cathode rays have on our understanding of atomic structure?.
- A.It suggests that atoms are indivisible.
- B.It indicates that atoms contain negatively charged particles.
- C.It proves that atoms are made entirely of electrons.
- D.It shows that electrons have no mass.
Model answer
What a good answer should say
- It indicates that atoms contain negatively charged particles.
Explanation
Why this works
The evidence from cathode ray experiments indicates that atoms contain negatively charged particles, which are electrons. This implies that the atomic model must include these particles, leading to the conclusion that electrons play a crucial role in the structure and behavior of atoms.
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