What is what element is the most reactive?

The most reactive element is fluorine, which is located in the top right corner of the periodic table in Group 17, also known as the halogens. Its high electronegativity and small atomic radius make it highly reactive and likely to form compounds with almost all other elements, including noble gases, which are generally inert. Fluorine is extremely reactive that it is so reactive that it can react with metals, glass, and water. It is also hazardous to handle and can cause severe chemical burns and lung damage.