- Group 17 elements are typical non-metals and also known as halogens.
- The elements in this group are fluorine. chlorine, bromine, iodine and astatine.
- In nature, all halogens exist as diatomic molecules. They are written as F2, Cl2, Br2, I2 and As2.
- Most of the halogens exist in nature as halide salts.
- Halide is the name given to the ion of halogens. The table below shows the corresponding halide of the halogen.