The word halogen means "salt-producing” because halogens react with metalsto produce many important salts, of which sodium chloride—table salt, or halite—is best known.
Properties:
Halogens are so reactive that they do not occur as free elements in nature. They are the most reactive nonmetals.
The halogen atoms carry seven valence electrons in their outermost electron shell.
This accounts for their higher reactivity and tendency to gain one electronand form ionic bondsor share electrons with other elements to form covalent bonds.
Among all the halogens, fluorine is the most reactive, and Iodine is the least reactive of all.
In combined form, fluorine is the most abundant of the halogens in Earth’s crust.
Halogens are the only group on the periodic table that has elements in the solid,liquid, and gasphases at room temperature.
At normal temperature and pressure, chlorine and fluorine are gasses, bromine is a liquid, and iodine and astatine are solids.
They are powerful oxidizing agents.
They have very high electronegativities.
Halogens have a tendency to form hydrogen halides, which are potent acids when they combine with hydrogen.
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