Editing Halogen (section)

==== Isotopes ====
Fluorine has one stable and naturally occurring [[isotopes of fluorine|isotope]], fluorine-19. However, there are trace amounts in nature of the radioactive isotope fluorine-23, which occurs via [[cluster decay]] of [[protactinium-231]]. A total of eighteen isotopes of fluorine have been discovered, with atomic masses ranging from 13 to 31. 

Chlorine has two stable and naturally occurring [[isotopes of chlorine|isotopes]], chlorine-35 and chlorine-37. However, there are trace amounts in nature of the isotope [[chlorine-36]], which occurs via [[spallation]] of argon-36. A total of 24 isotopes of chlorine have been discovered, with atomic masses ranging from 28 to 51.<ref name = "Nature's Building Blocks"/>

There are two stable and naturally occurring [[isotopes of bromine]], bromine-79 and bromine-81. A total of 33 isotopes of bromine have been discovered, with atomic masses ranging from 66 to 98. 

There is one stable and naturally occurring [[isotopes of iodine|isotope of iodine]], [[iodine-127]]. However, there are trace amounts in nature of the radioactive isotope [[iodine-129]], which occurs via spallation and from the radioactive decay of uranium in ores. Several other radioactive isotopes of iodine have also been created naturally via the decay of uranium. A total of 38 isotopes of iodine have been discovered, with atomic masses ranging from 108 to 145.<ref name = "Nature's Building Blocks"/>

There are no stable [[isotopes of astatine]]. However, there are four naturally occurring radioactive isotopes of astatine produced via radioactive decay of [[uranium]], [[neptunium]], and [[plutonium]]. These isotopes are astatine-215, astatine-217, astatine-218, and astatine-219. A total of 31 isotopes of astatine have been discovered, with atomic masses ranging from 191 to 227.<ref name = "Nature's Building Blocks"/>

There are no stable [[isotopes of tennessine]]. Tennessine has only two known [[synthetic radioisotope]]s, tennessine-293 and tennessine-294.