Question detail
How did Mendeleev contribute to the development of 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 arranged elements by their atomic number.
- C. He classified elements only as metals.
- D. He created the first electronic periodic table.
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 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 2cd918f2 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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