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. Because atomic weight was the only criterion used
- B. Because they had similar chemical properties
- C. Because their atomic numbers were not known
- D. Because they were discovered after the table was created
Answer
The correct option is Because atomic weight was the only criterion used.
Explanation
The correct option is Because atomic weight was the only criterion used. Because atomic weight was the only criterion used is correct because it directly supports the approved learning objective to explain why some elements were placed in inappropriate groups when atomic weight order was followed strictly. 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 2ba6d78a keeps this question distinct from adjacent atom, ion, isotope, group, period, and electronic-structure questions.
Common mistake
Misplacement of Elements
Students often think that all elements can be placed in groups based solely on their atomic weight without considering their properties.
Emphasize that elements were sometimes placed in inappropriate groups because atomic weight did not account for their chemical properties, leading to inconsistencies in the periodic table.
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