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.

The statement that is not correct for periodic classification of eleme

1.	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.
Answer» (iii) For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-orbitals.