(D) The statement in option $D$ is incorrect because,for transition elements,the filling of the $d$-subshell does not always follow a strictly regular

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For transition elements,electrons are filled one by one into the $d$-subshell with an increase in atomic number.

(D) The statement in option $D$ is incorrect because,for transition elements,the filling of the $d$-subshell does not always follow a strictly regular pattern due to the extra stability of half-filled $(d^5)$ and fully-filled $(d^{10})$ subshells. For example,in $Cr$ $(3d^5 4s^1)$ and $Cu$ $(3d^{10} 4s^1)$,the electron configuration deviates from the expected filling order.

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

Easy

Which of the following statements is not correct regarding the classification of elements in the periodic table?

A
The properties of elements are periodic functions of their atomic numbers.
B
The number of non-metallic elements is not greater than the number of metallic elements.
C
The first ionization energy of elements in a period does not change in a regular order with atomic number.
D
For transition elements,electrons are filled one by one into the $d$-subshell with an increase in atomic number.