The statement that is not correct for periodic classification of … - Vidyadip

MCQ

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 orbitals and before 4s-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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Answer

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

Explanation:

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

The order of filling the orbitals is.

Is, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, …

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