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 like lithium (Li), sodium (Na), and potassium (K). They are highly reactive, particularly with water and halogens, and their reactivity increases as you move down the group.
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Halogens (Group 17): This group includes elements like fluorine (F), chlorine (Cl), and bromine (Br). Halogens are very reactive, especially with alkali metals, as they readily form salts with them. Their reactivity decreases as you move down the group.
Both groups are characterized by their tendency to readily participate in chemical reactions.