Question detail
What role did isotopes play in Mendeleev's 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. They helped explain discrepancies in atomic weight order.
- B. They were not considered at all.
- C. They confirmed that all elements have the same number of neutrons.
- D. They were used to arrange elements by atomic mass.
Answer
The correct option is They helped explain discrepancies in atomic weight order..
Explanation
The correct option is They helped explain discrepancies in atomic weight order.. They helped explain discrepancies in atomic weight order. is correct because it directly supports the approved learning objective to explain how Mendeleev changed some element orders based on chemical properties. 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 75826c0d keeps this question distinct from adjacent atom, ion, isotope, group, period, and electronic-structure questions.
Common mistake
Mendeleev's Element Order
Students often think Mendeleev only arranged elements by atomic weight without considering their chemical properties.
Emphasize that Mendeleev prioritized chemical properties over atomic weight when rearranging elements in his periodic table.
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