The most active metals on the periodic table are found on the: lower left upper right middle upper left lower right

Answer: Option (a) is the correct answer.

Explanation:

Elements which are most electropositive or electronegative are the most reactive in nature. Therefore, they are active.

Elements of group 1 are also known as alkali metals. Elements of group 1 are lithium, sodium, potassium, rubidium, cesium, and francium.

All these are highly electropositive in nature and thus, are active. These are placed at the top left column of periodic table.

Thus, we can conclude that out of the given options, the most active metals on the periodic table are found on the lower left.