If the atomic number of an element is 33, it will be placed in the long form periodic table in the :

The element's atomic number 33's electrical configuration is

$1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{10}4{\mathrm{s}}^{2}4{\mathrm{p}}^3$

Since its last shell contains five electrons, its group is 15th, or VA, or 10 + 5 = 15.

Thus, it belongs to the fifth group.