Halogens

By: Manmeet, Madison, Neringa, and Kathy

Halogens

The Halogens are group 17 on the periodic table. The family elements are fluorine, chlorine, bromine, iodine, astatine. All the Halogen elements have 7 valence electrons in their outer shell. They are extremely reactive. The elements in this group react most with metals. Halogens are classified as non-metals. Some everyday examples are the chlorine in the pool, flameproofing objects, and toothpaste.


Fluorine

Isolated in 1886 by the scientist Ferdinand Frederic Henri Morisson in France. He passed an electric current through hydrogen fluorine. Fluorine is a nonmetal element. Fluorine is found in toothpaste which help prevents tooth and gum diseases.


Google Maps Link:

https://www.google.com/search?q=france&aq=f&oq=france&aqs=chrome.0.57j0j5j0j62l2.1357j0&sourceid=chrome&ie=UTF-8#q=paris+france&safe=active&spell=1


Symbol: F

Atomic #: 9

Melting Point: -219.6 degrees Celsius

Boiling point: -188.2 degrees Celsius


Chlorine

Isolated in 1774 by chemists Carl Wilhem Davey in Sweden. Chlorine is found in pool water because it destroys the bacteria in it.


Google Maps Link:

https://www.google.com/search?q=france&aq=f&oq=france&aqs=chrome.0.57j0j5j0j62l2.1357j0&sourceid=chrome&ie=UTF-8#q=Penzance%2C+Cornwall%2C+England&safe=active


Symbol: Cl

Atomic #: 17

Melting Point: -101.5 degrees Celsius

Boiling point: -34.04 degrees Celsius


Bromine

Bromine was isolated from chlorine in 1826 by A.J. Balard in Montpellier, France. Bromine is used for flameproofing agents and in some compounds used to purify water.


Google Maps Link:

https://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&authuser=0&q=montpellier+france&aq=&vps=1&jsv=473a&sll=38.003386,-79.420925&sspn=5.876599,9.876709&vpsrc=3&ie=UTF8&ct=clnk&cd=1&spell=1


Symbol: Br

Atomic #: 35

Melting Point: -7.2 degrees Celsius

Boiling point: 58.8 degrees Celsius


Iodine

Iodine was discovered in 1811 by Bernard Courtois in Dijon, France. Iodine has been used to treat thyroid disorders. It is found in seawater and in the seaweeds which absorb the compounds.


Google Maps Link:

https://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&authuser=0&q=montpellier+france&aq=&vps=1&jsv=473a&sll=38.003386,-79.420925&sspn=5.876599,9.876709&vpsrc=3&ie=UTF8&ct=clnk&cd=1&spell=1


Symbol: I

Atomic #: 53

Melting Point: 113.7 degrees Celsius

Boiling point: 184.3 degrees Celsius


Astatine

Astatine was discovered in 1940 by D.R. Corson in California. Astatine is one of the rarest elements in the universe. It is found in the Earth’s crust when the radioactive elements uranium and thorium decay. It is too rare to use but in some cases they use it for rare medical reasons. It could be used to cure Thyroid cancer.


Google Maps Link:

https://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&authuser=0&q=montpellier+france&aq=&vps=1&jsv=473a&sll=38.003386,-79.420925&sspn=5.876599,9.876709&vpsrc=3&ie=UTF8&ct=clnk&cd=1&spell=1


Symbol: At

Atomic #: 85

Melting Point: 301.8 degrees Celsius

Boiling point: 336.8 degrees Celsius


Environmental Health Concerns

1. There is no protective cage or glass on the halogens light

2. The lights are very hot and can cause fires