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

Chemistry · JEE Advanced · NTA Exams — Classification of Elements and Periodicity in Properties

1. The properties of elements are periodic function of their atomic numbers.
2. Non metallic elements are less in number then 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.

Answer

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

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