Question detail
Why was the discovery of isotopes important for 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. It clarified why atomic weights did not always match element order.
- B. It proved that all elements have the same number of neutrons.
- C. It showed that isotopes could not exist in nature.
- D. It indicated that atomic mass was irrelevant.
Answer
The correct option is It clarified why atomic weights did not always match element order..
Explanation
The correct option is It clarified why atomic weights did not always match element order.. It clarified why atomic weights did not always match element order. is correct because it directly supports the approved learning objective to explain how discovery of predicted elements supported Mendeleev's table. 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 3790a7e2 keeps this question distinct from adjacent atom, ion, isotope, group, period, and electronic-structure questions.
Common mistake
Misunderstanding Mendeleev's Predictions
Students often think that Mendeleev's predictions were purely random rather than based on chemical properties.
Emphasize that Mendeleev used observed chemical properties to predict the existence and properties of undiscovered elements, which later supported his periodic table.
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