The two groups of elements in the periodic table that are the most reactive are:
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Alkali Metals (Group 1): This group includes elements such as lithium, sodium, and potassium. Alkali metals are highly reactive, especially with water, and their reactivity increases as you move down the group.
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Halogens (Group 17): This group includes elements such as fluorine, chlorine, and bromine. Halogens are also very reactive, with their reactivity decreasing as you move down the group.
Both groups have a strong tendency to form compounds with other elements due to their electron configurations.