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Mendeleev handled undiscovered elements by leaving:
AGaps in the table
BExtra rows below
CWider columns out
DBlank pages aside
Answer & Solution
Correct answer: A. Gaps in the table
1. Some elements were still unknown when he published.
2. He proposed that they existed but were undiscovered.
3. So he left several gaps in the table for them.
_Source: syllabus Chemistry Part I, Chapter 3, Classification of Elements and Periodicity in Properties._
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