Question detail
What was a limitation of the 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. They were incomplete due to undiscovered elements
- B. They did not include noble gases
- C. They were arranged by atomic number
- D. They were based on electron configuration
Answer
The correct option is They were incomplete due to undiscovered elements.
Explanation
The correct option is They were incomplete due to undiscovered elements. They were incomplete due to undiscovered elements 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 b4b3e3aa 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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