Which of the following elements belongs in the halogen family?
The elements of seventh(A) group or seventeenth group are known as halogen. Halogens means ‘elements which form salt’ or ‘salt former’. These elements include fluorine, chlorine, bromine, iodine and astatine. Halogens are non-metals and have one electron in outer most shell. In above four options, option (A) is correct. Fluorine is the first element of the halogen group. Fluorine is present in the second period of the periodic table. The atomic number of fluorine is 9 and its atomic mass is 18.99. The electronic configuration of fluorine is 1s2 2s2 2p5. Moreover, it is a yellowish brown gas.
