Question detail
What was a limitation of the early periodic tables created by scientists?
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 incomplete
- B. They included all known elements
- C. They were arranged by atomic number
- D. They used electron configuration
Answer
The correct option is They were incomplete.
Explanation
The correct option is They were incomplete. They were incomplete 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 bb7030af 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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