1.

The statement that is not correct for the periodic classification of elements is `:`A. the properties of elements are the periodic functions of their atomic numbers.B. non`-` metallic elements are lesser in number than metallic elementsC. the first ionisation energies of elements along a period do not vary in a regular manner with increase in atomic numberD. for transition elements the `d-` subshells are filled with electrons monotonically with increase in atomic number.

Answer» Correct Answer - 4
The `d-` sub shells are not filled with electrons monotonically with increase in atomic number. There are some exceptions like `Cr,Cu ` etc.


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