Element: Fluorine---- Element Symbol: F
The atomic number is 9 and th mass number is 18.998. The period number is 2. The group number is 17, and the group name is Halogen. The state of matter of fluorine is a gas and it is a non metal.
Those are some real world uses of Fluorine. The toothpaste and drinking water use fluorine to prevent massive amounts of dental problems.
For the light bulbs....
We use Hydrofluoric acid to etch glass. It has the ability to dissolve glass.