Fluorine is the lightest halogen and the most electronegative element on the periodic table. It has nine protons and nine electrons. This makes it a very reactive element. It can easily combine with other elements to form compounds. Fluorine is used in many types of industrial applications, such as plastics and solvents. But the element is not readily found in its pure form. Fortunately, it can be obtained in a compound called fluoride.
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