Tyler, Tre, Haeley, Chelsea Halogen Family 17 Tyler, Tre, Haeley, Chelsea

Halogen Characteristics -Halogen contains the elements in group 17- Fluorine, Chlorine, Iodine, Astatine -All elements have 7 valence electrons -Most made with covalent compounds -When combining with another element is called a Halide -Often bond with metals in Group 1 -Highly Unstable -Tendency to form salts -Good oxidizers -Always found in nature chemically bonded

Iodine Parent: Bernard Courtois Birth Place and Date: 1811; France Gender: Non-Metal Protons/Electrons: 53 Neutrons: 74 Positive Aspects: Important in medicine, both radioactive and non-radioactive forms. -Silver Iodine is used in photography Can be added to table salt to prevent thyroid disease Other uses include catalysts, animal feeds and printing inks and dyes. Negative Aspects: -Slightly toxic in small doses, highly poisonous in large amounts -Iodine vapor causes extreme eye irritation

Iodine Density: 4.93 g/cm3 at 293 k Boiling point: 184.0 degrees C Melting point: 113.5 degrees C Specific Heat: 0.214 J/g K Electric Conductivity: 1.0 cm x 10-7 S cm-1 Heat Conductivity: 0.45 W m-1 K-1 Iodine can be found in Chilean saltpetre, caliches, old salt brines, and salt wells. -Valence #: 7 -Ion: -Oxidation number Maximum: 7 Minimum: -1 -Reactivity: -Compounds: -Oxide: I2O5, I4O9, I2O4 -Hydride: HI -Chloride: ICI, ICI3

Fluorine *Most reactive of all elements* *Founded by: Georgius Agricola (1530)* Pale yellow or brown Density: 1.7 g/mL Boiling Point: 188.12 C Protons: 9 Electrons: 9 Neutrons: 10 Melting Point: 219.67 C Valence Electrons: 7

Astatine *Founders: Dr. Corson, Mackenzie, and E. Segre at the University of California* Melting Point: 302 C Protons: 85 Electrons: 85 Neutrons: 125 Boiling Point: 340 C HIGHLY radioactive Density: 7g/cm2 Valence Electrons: 7

BrOMINE Br Parent: Antoine J Balard Birth Place/Date: 1826, Germany NON-METAL Br Parent: Antoine J Balard Birth Place/Date: 1826, Germany Protons/Electrons: 35 Neutrons: 45 Br Positive Aspects: Orthorhombic Crystal Structure, Red Color, used in pesticides and flame retardant materials, obtained from seawater Negative Aspects: Poisonous, smells bad- highly irritating to eyes and lungs, found in carcinogen 7

BrOMINE 3 Compounds: Acetyl Bromide, Bromo Benzene, Sodium Bromide Reactivity: intermediate between chlorine and iodine Oxidation States: 7, 5, 4, 3, 1, -1, Valence: 7 Density: 3.119 g/cm3 Boiling Point: 58.78 °C (331.93 K, 137.804 °F) Melting Point: -7.2 °C (265.95 K, 19.04 °F) Specific Heat: .473 J/g K

Sources http://www.chemnetbase.com/periodic_table/elements/iodine.htm http://www.chemicalelements.com/elements/br.html http://www.chem4kids.com/files/elem_halogen.html http://www.healthytomorrow.org/2007/10/chemicals.html http://chemicalelements.com/elements/i.html http://www.chemnetbase.com/periodic_table/elements/iodine.htm http://victonh.files.wordpress.com/2008/01/cuoctoa.jpg http://www.state.gov/cms_images/france_eiffeltower_2001_07_122.jpg http://www.chemicool.com/elements/iodine.html http://toxipedia.org/display/toxipedia/Iodine http://dl.clackamas.cc.or.us/ch106-01/images/61pt2.JPG http://periodic.lanl.gov/elements/85.html http://www.chemicool.com/elements/fluorine.html