Question

The problems in Mendeleev periodic table were related to ______ of elements.

Options

• classification, placement and periodicity

• only classification

• placement and periodicity

• none of these

Answer 1

The problems in Mendeleev periodic table were related to classification, placement and periodicity of elements.

Explanation:

Mendeleev's periodic table had structural limitations that affected all three aspects: the initial grouping and ordering (classification), the correct positioning of hydrogen and isotopes (placement), and irregular gaps where the repeating pattern of properties broke down (periodicity).