(D) The correct answer is $D$. For transition elements,the filling of $d$-sub-shells is not strictly monotonic due to the stability of half-filled and

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For transition elements the $d$-sub-shells are filled with electrons monotonically with increase in atomic number

(D) The correct answer is $D$. For transition elements,the filling of $d$-sub-shells is not strictly monotonic due to the stability of half-filled and fully-filled configurations (e.g.,$Cr$ is $3d^5 4s^1$ and $Cu$ is $3d^{10} 4s^1$). Therefore,the statement that $d$-sub-shells are filled monotonically is incorrect.

Class 11 Chemistry Classification of Elements and Periodicity in Properties Mix Examples - Classification of Elements and Periodicity in Properties

Medium

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

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A
The properties of elements are the periodic functions of their atomic numbers
B
Non-metallic elements are lesser in number than metallic elements
C
The first ionisation energies along a period do not vary in a regular manner with increase in atomic number
D
For transition elements the $d$-sub-shells are filled with electrons monotonically with increase in atomic number