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