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 very in a regular manner with increase in atomic number.
(d) For transition elements the d-subshells are tilled with electrons monotonically with increase in atomic number.
