Question detail
What was one significant change Mendeleev made to the periodic table?
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. He left gaps for undiscovered elements.
- B. He included noble gases in the first version.
- C. He arranged elements by their atomic number.
- D. He classified all elements as metals.
Answer
The correct option is He left gaps for undiscovered elements..
Explanation
The correct option is He left gaps for undiscovered elements.. He left gaps for undiscovered elements. is correct because it directly supports the approved learning objective to explain how Mendeleev changed some element orders based on chemical properties. 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 f83bb049 keeps this question distinct from adjacent atom, ion, isotope, group, period, and electronic-structure questions.
Common mistake
Mendeleev's Element Order
Students often think Mendeleev only arranged elements by atomic weight without considering their chemical properties.
Emphasize that Mendeleev prioritized chemical properties over atomic weight when rearranging elements in his periodic table.
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