Introduction
The The vertical column of non-metal elements next to group 0 in the periodic table, also called the halogens. A substance made of one type of atom only. are called the halogens. They are placed in the vertical column, second from the right, in the A tabular representation of all known elements in order based on atomic number, eg all the noble gases are found on the right of 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 鈥榟alogen鈥 means 鈥榮alt former鈥.