GCSE AQA Chemistry Group 7 - The Halogens

Halogens

The group 7 elements are called halognes. They are placed in the vertical column, second from the right, in the periodic table. 

Chlorine, bromine and iodine are the three common group 7 elements. Group 7 elements form salts when they react with metals. The term 'halogen' means 'salt former.'

- all form diatomic molecules except for astatine 

- all have 7 valence electrons

- reactivity of the elements decreases down the group as…