(B) The $d$-subshell has $5$ orbitals, which can accommodate a maximum of $10$ electrons $(2 \times 5 = 10)$.Therefore, the $d$-block consists of $10$

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The $d$-block has $8$ columns, because a maximum of $8$ electrons can occupy all the orbitals in a $d$-subshell.

(B) The $d$-subshell has $5$ orbitals, which can accommodate a maximum of $10$ electrons $(2 \times 5 = 10)$.Therefore, the $d$-block consists of $10$ columns.Statement $(b)$ is incorrect because it states that the $d$-block has $8$ columns.

Class 11 Chemistry Classification of Elements and Periodicity in Properties Extended or long form of periodic table

Medium

Which of the following statements related to the modern periodic table is incorrect?

A
The $p$-block has $6$ columns, because a maximum of $6$ electrons can occupy all the orbitals in a $p$-subshell.
B
The $d$-block has $8$ columns, because a maximum of $8$ electrons can occupy all the orbitals in a $d$-subshell.
C
Each block contains a number of columns equal to the number of electrons that can occupy that subshell.
D
The block indicates the value of the azimuthal quantum number $(l)$ for the last subshell that received electrons in building up the electronic configuration.