P5+-+Halogen

** Halogen is in group 17, period 2 to 6 on the periodic Table. There are five elements in Halogen:
 * [[image:periodic_table_of_elements.gif]]__Halogen__
 * Fluorine- Gas
 * Chlorine- Gas
 * Bromine- Liquid
 * Iodine- Solid
 * Astatine- Solid

Three physical properties of Halogens are:
 * Most of the elements in the Halogens have a low melting points.
 * Boiling points range from -180 degrees celcius to 200 degrees celcius
 * Chlorine is a highly toxic gas.

Three chemical properties of Halogens:
 * Halogens have a high ability to oxidise.
 * Chlorine explosively reacts with hydrogen.
 * Bromine reacts with relatively unreactive metals such as platinum and palladium.

Three interesting facts about halogen are:
 * Halogen is also called "Salt Formers."
 * Chlorine, Bromine and Iodine can hold up to 14 electrons.
 * Fluorine boils at -188.14 degrees Celcius.

Uses of Halogens:
 * Chlorine is used in small amounts to kill bacteria in water.
 * Iodine is used in medical treatments.

Cited Sources:

Dale R. Corson, Kenneth Ross MacKenzie. “Astatine” Online Image. hubpages.com. 26 Oct. 2009 []

Gale, Thomas “Bookrags.” Bookrags. 2006. October 26, 2009. < [] >

“chemistryexplained” JRank. 2009. Advameg Inc. October 26, 2009. < [] >

“onlinegeneralstore” October 26, 2009. < [] >

“elementsdatabase” 2009. Art Branch Inc. October 26, 2009 < [] >

Krebs E, Robert “Books.google.com” Google. 2006. October 26, 2009 < [|http://books.google.com/books?id=yb9xTj72vNAC&pg=PA245&lpg=PA245&dq=What+period+and+group+are+Halogens+in&source=bl&ots=iuTWt_zJ0e&sig=_bE5r5BwSz4Nj05QGyW8Q3IZKF0&hl=en&ei=gOXdSqKmNofENq_z6eIN&sa=X&oi=book_result&ct=result&resnum=1&ved=0CAwQ6AEwAA#v=onepage&q=What%20period%20and%20group%20are%20Halogens%20in&f=false] >

Bentor, Yinon “chemicalelements” 1996. October 26, 2009. < [] >