The statement that is not correct for the periodic classification of elements is `:`

Options

A. the properties of elements are the periodic functions of their atomic numbers.
B. non`-` metallic elements are lesser in number than metallic elements
C. the first ionisation energies of elements along a period do not vary in a regular manner with increase in atomic number
D. for transition elements the `d-` subshells are filled with electrons monotonically with increase in atomic number.

Answer

4

Explanation

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