Question detail
What did Mendeleev do to accommodate undiscovered elements in his 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. He left gaps for them
- B. He rearranged all known elements
- C. He ignored atomic weight
- D. He classified them as metals
Answer
The correct option is He left gaps for them.
Explanation
The correct option is He left gaps for them. He left gaps for them is correct because it directly supports the approved learning objective to describe how early scientists arranged elements by atomic weight before subatomic particles were discovered. 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 350c8922 keeps this question distinct from adjacent atom, ion, isotope, group, period, and electronic-structure questions.
Common mistake
Misunderstanding Element Arrangement
Students often think that early scientists arranged elements by atomic number instead of atomic weight.
Remember that early arrangements were based on atomic weight, and atomic number was established later with the discovery of subatomic particles.
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