Home Chemistry Classification of Elements and Periodicity NCERT Examplar The statement that is not correct for period…
Chemistry Classification of Elements and Periodicity NCERT Examplar Single Correct MCQ
Published on: August 12, 2026

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

A
The properties of elements are periodic function of their atomic numbers
B
Non-metallic elements are less in number than metallic elements
C
For transition elements, the 3d-orbitals are filled with electrons after 3p-orbital and before 4 s-orbitals
D
The first ionisation enthalpies of elements generally increase with increase in atomic number as we go along a period

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Verified by Experts
The correct answer is:
C

3d orbital is filled when 4s orbital gets completely filled. In case of transition elements (or any elements), the order of filling of electrons in various orbital is 3d.

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