Fluorine
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Fluorine (symbol F) is a chemical element which exists as a yellow diatomic gas. Its atomic number (which is the number of protons in it) is 9, and its atomic mass is 19. It is part of the Group 7 (halogens) on the periodic table of elements.
It is the most chemically reactive of all the elements.
[change] Chemical properties
It is very reactive gas, which exists as diatomic molecules. Due to the very high electron affinity of fluorine, the atoms of this element gain electrons very easily.
[change] See also