The statements that is not correct for the periodic classification of elements is:
(a) the properties of elements are the periodic functions of their atomic number
(b) non-metallic elements are lesser in number that metallic elements
(c) the first ionization energies of elements along a period do not vary in a regular manner with increase in atomic number
(d) for transition elements, the d-sub-shells are filled with electrons monotonically with the increase in atomic number.
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