In the long form of the periodic table, the number of groups under p and d blocks are

Actually in the periodic table p subshell contains total 3 orbitals (${\mathrm{P}}_{\mathrm{x}, }{\mathrm{P}}_{\mathrm{y},} {\mathrm{P}}_{\mathrm{z}}$ ) and each orbital can accommodate for 2 electrons. Hence, there are total 6 groups under p subshell. In similar way d subshell has total 5 orbitals and it can accommodate for 10 electrons. It means under d subshell total 10 groups are present. Therefore, number of groups under p and d blocks are 6, 10 respectively.