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Which one of the following statements for D.I. Mendeleef, is incorrect? (1) He authored the textbook – Principles of Chemistry. (2) At the time, the proposed Periodic Table of elements structure of atom was known. (3) Element with atomic number 101 is named after him. (4) He invented accurate barometer.

1. He authored the textbook – Principles of Chemistry.
2. At the time, the proposed Periodic Table of elements structure of atom was known.
3. Element with atomic number 101 is named after him.
4. He invented accurate barometer.

Correct answer: At the time, the proposed Periodic Table of elements structure of atom was known.

Solution

This statement is incorrect because when Mendeleev developed his Periodic Table, the structure of the atom was not fully understood, and concepts like atomic structure and electron configuration were still being explored.

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