Question detail
Why did Mendeleev's periodic table include gaps?
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. To predict the properties of undiscovered elements
- B. To separate metals from non-metals
- C. To arrange elements by atomic mass only
- D. To show the historical development of elements
Answer
To predict the properties of undiscovered elements
Explanation
The gaps allowed Mendeleev to predict the existence and properties of elements that had not yet been discovered.
Common mistake
Misunderstanding Mendeleev's Gaps
Students often think Mendeleev left gaps randomly without scientific reasoning.
Emphasize that Mendeleev left gaps based on the properties of elements and predicted their existence, which was a systematic approach to the arrangement of the periodic table.
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