The halogens are all on the second rightmost column of the periodic table. (The rightmost column belongs to the noble gases.) - Alonso del Arte, Apr 26 2011
From Daniel Forgues, Jul 12-13 2015: (Start)
Hydrogen is not a halogen: although its valence shell is one electron short of being full (like the halogens), it has only one valence electron (like the alkali metals).
Halogens: 9: fluorine (F), 17: chlorine (Cl), 35: bromine (Br), 53: iodine (I), 85: astatine (At) and 117: Ununseptium (Uus).
Astatine: behaves chemically like iodine, highly radioactive.
Ununseptium: metal (...then not halogen?), highly radioactive. (End)