What is symbol of flourine?

The symbol for fluorine is F. It is a highly reactive, pale yellow or greenish gas that is the most electronegative and reactive of all the elements. It is commonly found in ionic compounds such as fluoride minerals and is widely used in the production of many consumer products including toothpaste, pesticides, refrigerants, and plastics. Fluorine is also used in nuclear industries as a coolant for high-temperature reactors. In its pure form, it is highly toxic and corrosive to living tissues and other materials, but its compounds are essential for life and are found in many biological processes. Fluorine is the thirteenth most abundant element in the earth's crust, but is not found in its elemental form due to its high reactivity.