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Halogen

Halogen

From the Latin, meaning "salt-former". 

The group of [[chemical element]]s in group VIIA of the [[Periodic Table]]; specifically [[Fluorine]], [[Chlorine]], [[Bromine]], [[Iodine]], and [[Astatine]].
These elements are [[Chemistry/diatomic|diatomic]] molecules in their natural form. They require one more electron to fill their outer [[electron shell]]s, and so have a tendency to form a singly-charged negative [[ion]].