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 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.

Options

A. The properties of the elements are periodic function of their atomic numbers.
B. No. of non-metallic elements is less than the no. of metallic elements.
C. First ionization energy of elements does not increase regularly with the increasing of atomic number in a period.
D. d-subshell is fiJled by final electron with increasing atomic number of inner transition elements.

Answer

D