Here's why:
* Transition metals are found in the d-block of the periodic table. They are characterized by having partially filled d orbitals in their atoms or ions. This leads to their unique properties like variable oxidation states, colorful compounds, and catalytic activity.
* s-block elements are the alkali metals and alkaline earth metals. They have their outermost electrons in the s orbital.
* p-block elements include a wide variety of elements, including halogens, noble gases, and metalloids. They have their outermost electrons in the p orbital.
So, elements in the s and p blocks are classified as main group elements or representative elements, not transition metals.
