2) Element symbol: F
 

3) Number of electrons, protons, and neutrons: 9 electron, 9 proton, 10 neutrons
 

4) Atomic number: 9
 

5) Atomic mass: 18.998403
 

6) Characteristics:

Fluorine is a pale, greenish-yellow gas, slightly heavier than air, poisonous, corrosive, and of penetrating and disagreeable odor.
 

7)

History:

Fluorine was discovered in 1771 by the Swedish chemist Carl Wilhalm Scheele and was isolated in 1886 by the French chemist Henri Maissan (1852-1907). He obtained the element by electrolyzing anhydrous hydrogen fluoride dissolved in acid potassium fluoride, which conducted the electric current.

Three things made from the element:

Fluorine compounds have many applications.

- the chlorefluoro carbons, odorless and nonpoisonous liquids or gases such as Freon, are used as dispensing angen in aerosol sprays and refrigerants.

- another chemical, Teflon, a fluorine plastic that is very resistant to most chemical action, is wildly used to make such products as motor gaskets and dashboard accessories in the automobile industry.

- Teflon is also used as a coating on the inner surface of frying pans and other kitchen utensils to reduce the need for fat in cooking.
 

8) Isotopes:

No common isotopes.
 

9) Fluorine is the most chemically active of the nonmetallic elements. It combines directly with most elements and indirectly with nitrogen, chorine, and oxygen.
 

10) Fluorine melts at -219.61 °C (-363.30 °F) and boils at -188.13 °C (-306.63 °F).