The Most Reactive Element | #askIITians The most reactive element among all the chemical elements is fluorine (F). Fluorine is located in the halogen group of the periodic table and has an atomic number of 9. It is extremely reactive due to its high electronegativity and its tendency to readily gain one electron to achieve a stable electron configuration. As a result, it reacts vigorously with a wide range of other elements and compounds, often releasing a significant amount of energy in the pro