Final answer:
The most reactive metals are located in the top far left of the periodic table, specifically among the alkali metals in Group 1 and the alkaline earth metals in Group 2.
Step-by-step explanation:
The most reactive metals are located at the top far left of the periodic table. This area comprises of Group 1, which contains the alkali metals, and Group 2, the alkaline earth metals. These metals have very low ionization energies and low electronegativities, which accounts for their high reactivity. The most reactive metal is cesium, followed closely by francium; however, francium is exceedingly rare and not widely observed. Additionally, metals such as lithium, sodium, and potassium in Group 1 are known to react explosively with water. The periodic trend indicates that as we move from the bottom to the top of these groups, the reactivity of metals increases.