(B) At the time of the construction of Mendeleev's periodic table,the following information was not known:$(i)$ Internal structure of atoms$(ii)$ Suba

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(B) At the time of the construction of Mendeleev's periodic table,the following information was not known:$(i)$ Internal structure of atoms$(ii)$ Subatomic particles (like protons,neutrons,and electrons)$(iii)$ Electronic configuration of elementsTherefore,the concept of atomic number was not known,as it is based on the number of protons.