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

 (i) The properties of elements are periodic function of their atomic numbers.

 (ii) Non-metallic elements are less in number than metallic elements.

(iii) For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-orbitals.

 (iv) The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period.

Answers (1)

The answer is the option (iii) For transition elements; the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-orbitals.

Explanation: According to the  Aufbau principle, the 3d-orbitals are filled after the  4s and before the  4p orbitals, as the energy of the 4s orbital is lesser than the  3d orbital.

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