Which element is considered the most reactive of all elements?

Fluorine is considered the most reactive element due to its high electronegativity and the small size of its atoms. This allows fluorine to attract electrons strongly, making it highly efficient at forming compounds with other elements. Its ability to readily gain an electron means that it can react explosively with many substances, including noble gases under certain conditions. When discussing reactivity, particularly in terms of nonmetals, fluorine's position at the top of the halogen group (Group 17) underscores its unique reactivity compared to other elements, which tend to be less aggressive in pursuing electron exchange. This extreme reactivity is evident in its reactions with metals and nonmetals alike, often leading to the formation of ionic compounds.