Teaching OSSSC TGT Teachers Mock Test Series 2025 Chemistry Classification of Elements and Periodicity in Properties
The statement that is not correct for periodic classification of elements is:
1
The properties of elements are periodic function of their atomic numbers.
2
Non metallic elements are less in number than metallic elements
3
For transition elements, the 3d-orbitals are filled with electrons after 3p-orbitals and before 4s-orbitals.
4
The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period.