: When they react with metals, they produce ionic compounds known as salts. The most famous is sodium chloride (common table salt).
: They react with hydrogen to form binary compounds like hydrogen chloride, which become strong acids when dissolved in water.
: Chlorine and its compounds are used to produce bleach and purify water by killing bacteria. The "Halogen Cycle" in Lighting Halogen | Elements, Examples, Properties, Uses, & Facts