O3 is also found in nature, but will kill anything it comes in contact with. But while this gas may be deadly, it is also essential for life on earth. O3 is the element that keeps ultraviolet light out. Green The atomic number of Fluorine is 9, and has 10 Neutrons. Fluorine was discovered in 1886 by Joseph Henri Moissan Halogens are used in many different things that we use every day.
Fluorine is used in tooth paste.
Because the atoms share only one electron and because they make one covalent bond they are called single bonds. Here is an example of single bonding, the red H represent the Hydrogen and the small circles represent the electrons. A double bond is where two atoms share two electrons. These two atoms bond because they are trying to be stable like a noble gas. Here is an example of double bonding, the red O represent the oxygen and the small circles represent the electrons.