Question detail
Why were some elements placed in inappropriate groups in early periodic tables?
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. When atomic weight order was followed strictly
- B. Due to their atomic number
- C. Because of their reactivity
- D. Based on their electron arrangement
Answer
The correct option is When atomic weight order was followed strictly.
Explanation
The correct option is When atomic weight order was followed strictly. When atomic weight order was followed strictly 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 e82376b4 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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