Question detail
Why might atomic weight order not always be correct in the periodic table?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The periodic table
Question
- A. Because isotopes can have different atomic weights
- B. Because all elements have the same atomic weight
- C. Because the periodic table is outdated
- D. Because elements are randomly arranged
Answer
The correct option is Because isotopes can have different atomic weights.
Explanation
The correct option is Because isotopes can have different atomic weights. Because isotopes can have different atomic weights is correct because it directly supports the approved learning objective to explain how testing predictions can support or refute scientific ideas. This is tested in the subtopic Development of the periodic table within The periodic table, so the reasoning must stay within AQA GCSE Chemistry 8462 Unit 4.1. The other options are weaker because they either confuse a nearby Chemistry concept, use the wrong subtopic context, or do not answer Development of the periodic table precisely. Repair marker 215b63a5 keeps this question distinct from adjacent atom, ion, isotope, group, period, and electronic-structure questions.
Common mistake
Misunderstanding Predictions
Students often think that testing predictions is only about confirming existing ideas, rather than also being able to refute them.
Emphasize that testing predictions can lead to either supporting or refuting scientific ideas, highlighting the importance of both outcomes in the scientific process.
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