1. Group 17 Halogens By: Eli, Emma, Liz, Monica, and MJ

2.  Halogens are highly reactive nonmetals in group 7A of the periodic table.  Nonmetals  All are diatomic and very reactive  fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At) What are halogens?

4.  Highly reactive (especially with alkali metals and alkaline earths)  This reactivity is due to high electronegativity and high effective nuclear charge  Often used as sterilizing and disinfecting agents  they can be harmful or lethal to biological organisms in sufficient quantities  Each element has 7 valence electrons  Can gain an electron by reacting with atoms of other elements. Chemical Properties

5.  range from solid (I2) to liquid (Br2) to gaseous (F2 and Cl2) at room temperature.  low melting points and boiling points.  become darker as you go down the group Physical Properties

6.  Fluorine  A pale yellow gas: the most abundant halogen  Chlorine-  is greenish yellow gas with a pungent odor: the most abundant ions that dissolve in the ocean  Bromine-  red-brown liquid that easily evaporates into a gas  Iodine  A pure solid: violet: many important roles in life, including thyroid hormone production  Astatine  the heaviest halogen: radioactive: black/metallic Elements

9.  http://chemistry.about.com/od/elementgroups/ig/Halog ens-Photo-Gallery/ http://chemistry.about.com/od/elementgroups/ig/Halog ens-Photo-Gallery/  http://chemistry.about.com/od/elementgroups/a/haloge ns.htm http://chemistry.about.com/od/elementgroups/a/haloge ns.htm  http://chemwiki.ucdavis.edu/Inorganic_Chemistry/Descri ptive_Chemistry/p- Block_Elements/Group_17%3A_The_Halogens http://chemwiki.ucdavis.edu/Inorganic_Chemistry/Descri ptive_Chemistry/p- Block_Elements/Group_17%3A_The_Halogens  https://www.boundless.com/chemistry/textbooks/boun dless-chemistry-textbook/nonmetallic-elements- 21/halogens-155/properties-of-the-halogens-597-6573/ https://www.boundless.com/chemistry/textbooks/boun dless-chemistry-textbook/nonmetallic-elements- 21/halogens-155/properties-of-the-halogens-597-6573/ Works Cited