The statement that is not correct for periodic classification of elements is
(a) The properties of elements are periodic function of their atomic numbers.
(b) Non-metallic elements are less in number than metallic elements.
(c) For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-orbitals.
(d) The first ionization enthalpies of elements generally increase with increase in atomic number as we go along a period.

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