The Washington tree, located in the Giant Forest Grove in Sequoia National Park provides a good example of the aforementioned phenomena. This tree was the second largest tree in the world (only the General Sherman tree was larger) until just a few years ago.
A halogen is a representative element from group VII in the periodic table. More specifically, Fluorine, Chlorine, Bromine, Iodine, and Astatine. Astatine is a very unstable radionuclide so is not normally dealt with. A halide is a chemical compound of halogens bonded to more electro positive elements.
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.