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The elements at the extreme left and right of the periodic table are the most reactive because they have the highest number of valence electrons.
The elements at the far left of the periodic table are grouped as alkali metals and have one valence electron. This electron is easily lost in a chemical reaction, making these elements highly reactive.
The elements at the far right of the periodic table are grouped as halogens and have seven valence electrons. These electrons are easily gained in a chemical reaction, making them highly reactive.
This reactive nature of these elements is due to the fact that they require the least amount of energy to gain or lose electrons and form stable compounds. This makes them more reactive than other elements in the periodic table.
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