Group+17Hr7

-The term Halogen means "Salt-former" -Poor conductors of heat and electricity -All have patterns in their electron configurations -Highly reactive, especially with Alkali metals and Alkaline earths -Each have seven Valence Electrons -While in room temperature, they range from a gas, liquid, to a solid ** =** Flourine **= [] __** A pale-yellow, highly corrosive, poisonous, gaseous halogen element, the most electronegative and most reactive of all the elements. **__ Atomic # 9​ Atomic Mass 18.998 Protons 9 Neutrons 10 Electrons 9 Fluorine 9 different types of isotopes Electron Configuration: 1s1 2s2 2p5 n=2 l=1 m1=0 s=-1/2
 * -__Group 17__

//__Common Uses:__// Air Conditioning, Insecticide, Toothpaste
= ** Chlorine ** =

Atomic # 17
Atomic Mass 35.453 Protons 17 Neutrons 18 Electrons 17 Chlorine has two isotopes: 35Cl and 37Cl Electron Configuration: [Ne] 3s2 3p5 n=3 l=1 ml=0 ms=-1/2 by Sir Humphry Davy in 1810.** **If chlorine is bubbled through water in the presence of bright sunlight, a colourless gas is produced and the green colour, due to chlorine, fades**. __**Common Uses:**__ **Chlorine is used in anything from plastics and water purifiers, to non-stick frying pans and waterproof jackets.**
 * __Fun Facts:__** **Discovered in 1774 by Carl Wilhelm Scheele and later identified

=** Bromine **= [] __** A heavy, volatile, corrosive, reddish-brown, nonmetallic liquid element, having a highly irritating vapor. **__ Atomic # 35 Atomic Mass 79.90 Protons 35 Neutrons 45 Electrons 35 Bromine has 35 different types of isotopes Electron Configuration: [Ar] 4s2 3d10 4p5 n=4 l=1 ml=0 ms=-1/2

__Common Uses:__ Bromine is used to control algae and bacteria growth in industrial processes and is also used in many over the counter pharmaceuticals, such as sedatives, and antihistamines.** =** Iodine **= [] __** A lustrous, violet-black, corrosive, poisonous halogen element having radioactive isotopes **.__ Atomic # 53 Atomic Mass 126.90 Protons 53 Neutrons 74 Electrons 53 Iodine has 37 different types of isotopes 127I is the only stable one Electron Configuration:[Kr] 5s2 4d10 5p5 n=5 l=1 ml=0 ms=-1/2 __Common Uses:__ Used as a germacide and apparently it helps to get rid of baldness down in mexico.**
 * __Fun Facts:__ Bromine was discoverd in 1826 by two different people around the same time, Carl Lowig (a german chemist) and Antoine J. Balard (a french chemist).
 * __Fun Facts:__ In 1811, a french chemist by the name of Bernard Courtois discoverd Iodine while trying to create saltpeter using the ashes from seaweed instead of wood to make potassium nitrate.

= **Astatine** = [] __** A highly unstable radioactive element, the heaviest of the halogen series, that resembles iodine in solution. **__ Atomic # 85 Atomic Mass 210 Protons 85 Neutrons 125 Electrons 85 Astatine has 33 different types of isotopes Electron Configuration:[Xe] 6s2 4f14 5d10 6p5 n=6 l=1 ml=0 ms=-1/2 ==

__Common Uses:__ As of now there is no common use for this chemical. It is studied by nuclear scientists because of its high radioactivity.**
 * __Fun Facts:__ Discoverd by D.R. Corson in 1940. The total amount of astatine on the earth's crust is less then 30 grams. Astatine breaks down so fast that experiments on it can only last a few hours.

http://www.facts-about.org.uk/science-element-fluorine.htm type in other elements where fluorine is http://mooni.fccj.org/~ethall/fluor/fluor.htm http://www.lenntech.com/periodic/elements/cl.htm http://www.lenntech.com/processes/disinfection/chemical/disinfectants-bromine.htm http://education.jlab.org/itselemental/ele053.html http://www.lenntech.com/periodic/elements/at.htm http://www.absoluteastronomy.com/topics/Halogen