The elements fluorine, chlorine, and bromine are also known as

The elements fluorine, chlorine, and bromine are also known as halogens. 

Iodine and astatine are also included in halogens. These are non-metallic chemical elements which are present in group seventeen in periodic table. they are also known as salt forming elements. We can use chlorine and bromine in bleaching and disinfecting water.

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