Which one of the following statements for D.1. Mendeleef. is incorrect? (a) Element with atomic ...

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Which one of the following statements for D.1. Mendeleef. is incorrect?
(a) Element with atomic number 101 is named after him.
(b) He authored the textbook - Principles of Chemistry .
(c) He invented accurate barometer.
(d) At the time, he proposed periodic table of elements structure of atom was known.
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