Answer: The correct answer is lower left.
Explanation:
Metals are defined as the elements which loose electrons to attain stable electronic configuration.
Reactivity of metals is defined as the tendency of metals to loose electrons. If a metal looses electrons easily, it means that it is more reactive.
Reactivity increases down the group and decreases across a period for metals.
In the periodic table attached,
- The elements present in lower left are metals which are most reactive.
- The elements present in upper right are non-metals which are most reactive.
- The elements present in middle are metals which are less reactive.
- The elements present in upper left are metals which are least reactive reactive.
- The elements present in lower right are non-metals which are least reactive.
Hence, the correct answer is lower left.
