Question detail
What caused some elements to be 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. The strict adherence to atomic weight order.
- B. The use of atomic number instead of atomic weight.
- C. The lack of knowledge about electron configuration.
- D. The focus on chemical properties alone.
Answer
The correct option is The strict adherence to atomic weight order..
Explanation
The correct option is The strict adherence to atomic weight order.. The strict adherence to atomic weight order. is correct because it directly supports the approved learning objective to explain why early periodic tables were incomplete. 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 7f2b55e8 keeps this question distinct from adjacent atom, ion, isotope, group, period, and electronic-structure questions.
Common mistake
Incomplete Early Tables
Students often state that early periodic tables were incomplete because they lacked certain elements without explaining the reason for the gaps.
Students should clarify that early periodic tables were incomplete because they did not account for the properties of elements that were not yet discovered, leading to gaps in the arrangement.
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