Class 11 Chemistry Classification of Elements and Periodicity in Properties History of periodic table

Easy

Which of the following information was not known at the time when Mendeleev's periodic table was constructed?

A
Atomic mass
B
Atomic number
C
Valency
D
Chemical properties

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Class 11 Questions

Class 11

Chemistry Questions

Chapter

Classification of Elements and Periodicity in Properties

Subtopic

History of periodic table

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