The number of elements in each of the long periods in the periodic table is

Which of the following statements is incorrect?

Which of the following pairs has both members from the same period of the periodic table?

In the modern periodic table,which groups of elements are known as $d$-block elements?

What is the electronic configuration of the third element of group-$2$ in the periodic table?

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 $p$-shell.
$(b)$ 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 value of azimuthal quantum number $(l)$ for the last subshell that received electrons in building up the electronic configuration.