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.
Editors Contribution (0.00 / 0 votes) Rate this definition: halogen. Halogen (noun) involves five elements such as fluorine, chlorine, bromine, iodine and astatine. That part in a group VIIA of the periodic table. Halogen is a negative ions that react with most metals to form salts. halogen Is a group in the periodic table consisting of five chemically related elements with similar properties. Any of a group of five nonmetallic elements with similar properties.