On behalf of the ESPAS Task Force, RAND Europe was commissioned to study global societal trends to 2030, and to consider the long-term policy challenges the EU should prioritise for the next institutional cycle (2014-2019) and beyond. The research team focused on five main themes including:
Freebase(0.00 / 0 votes)Rate this definition: Halogen. The halogens or halogen elements are a group in the periodic table consisting of five chemically related elements, fluorine, chlorine, bromine, iodine, and astatine. The artificially created element 117 may also be a halogen. In the modern IUPAC nomenclature, this group is known as group 17. The group of halogens is the only periodic table group which contains elements in all three familiar states of matter at standard temperature and pressure.
Asker's rating. 1  Define Halogen. 2  A halogen is a representative element from group VII in the periodic table. 3  Halogen = any element from Group 7. 4  Define Halides. 5  This Site Might Help You. 6  Halogen and Halide refer to the elements in the 17 th row of periodic table... 7  Halogen is the elemental form.