Minerals: calcium chloride, silver chloride, potassium iodide, potassium chloride, sodium chloride, Iodoform, Chlorine Fluoride, Organohalides, Bromoethane. fluoroaluminates cryolite, cryolithionite, thomsenolite, and weberite.
Characteristics: they all form acids when combines with hydrogen, they are all failry toxic, readily combine with metals to form salts, have seven valence electrons in outer shell, highly reactive and electronegative
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Economic Use: fertilizer, in nutrition and chemical feedstock, and as ore of some metals.
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