chlorine
Hydrogen...
carbon
It is fluorine. Fluorine is part of the halogens they are very active nonmetals.
Carbon, if not wiki it
This is chlorine.
Fluorine is the most active non-metal due to its high electronegativity, which allows it to readily gain an electron to achieve a stable electron configuration. Francium is the most active metal because it has the lowest ionization energy among all the elements, making it highly reactive and prone to losing an electron to form a positive ion.
Fluorine
Lithium is NOT the most active alkali metal. Francium is the most active but is available in such trace quantities and radioactive that for practical purposes it is Cesium that is considered most active.
The most chemically active non-metal, and the most reactive element overall, is fluorine. Fluorine has an extremely high electronegativity, meaning that it will remove an electron form almost anything. Therefore, it is amazingly reactive, and it even reacts with glass.
fluorine is the most reactive non metal in the periodic table.
Fluorine is the most reactive non-metal.
Francium has the lowest electronegativity and fluorine the highest.