Question detail
What was a limitation of early periodic tables before Mendeleev's work?
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 were based solely on atomic weight
- B. They did not account for atomic number
- C. They included too many elements
- D. They were too complex for scientists
Answer
The correct option is They were based solely on atomic weight.
Explanation
The correct option is They were based solely on atomic weight. They were based solely on atomic weight is correct because it directly supports the approved learning objective to describe how Mendeleev left gaps for undiscovered elements. 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 52fe21f3 keeps this question distinct from adjacent atom, ion, isotope, group, period, and electronic-structure questions.
Common mistake
Misunderstanding Mendeleev's Gaps
Students often think Mendeleev left gaps randomly without scientific reasoning.
Emphasize that Mendeleev left gaps based on the properties of elements and predicted their existence, which was a systematic approach to the arrangement of the periodic table.
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