Group 17 Elements: The Halogens
Christyna.H & Nijayah.C
The Elements that are in this Group
- Flourine (F)
- Chlorine (Cl)
- Bromine (Br)
- Iodine (I)
- Astattine (At)
Description of each Element
Fluorine
- Atomic Number- 9
- Atomic Mass- 19 amu
- Symbol- (F)
- Uses- Is in toothpaste and in drinking water to prevent dental cavities.
- Discovery- Henri Moissan
- Valence Electrons- 7
Chlorine
- Atomic Number- 17
- Atomic Mass- 35 amu
- Symbol- (Cl)
- Uses- Is in dyes,textiles, medicines, antiseptics, insecticides and paints.
- Discovery- Carl Wilhelm Scheele
- Valence Electrons- 7
Bromine
- Atomic Number- 35
- Atomic Mass- 8- amu
- Symbol- (Br)
- Uses- In water treatment in swimming pools and hot tubs.
- Discovery- Antoine Jermoe
- Valence Electrons- 7
Idoine
- Atomic Number- 53
- Atomic Mass- 127 amu
- Symbol- (I)
- Uses- It is used in Medicine to kill fungus, and bacteria
- Discovery- Bernard Courtios
- Valence Electrons- 7
Astatine
- Atomic Number- 85
- Atomic Mass- 21- amu
- Symbol- (At)
- Uses- Sometimes used as a a radioactive tracer and in cancer treatment
- Discovery- Dale Corson
- Valence Electrons- 7
What they all have in common
Group 17, or the Halogen Group, all have 7 valence electrons and will gain or share an electron when forming compounds with other elements. They are all non-metals except for astatine, which is a metalloid. They are the most reactive non-metals because they only need one more electron to fill the outer shell.
Interesting Facts about Element 17
- All halogens are electronegative : they gain electrons very quickly, making them the most reactive of all chemical elements.
- Fluorine are used in non- stick Teflon pans.
- Halogen means "salt come to be" and it's significant because halogens form salt when reacted near metal.
- Halogens were names by a Swedish chemist by the name of Jöns Jakob Berzulíus
Websites
- http://chemteacher.chemeddl.org/services/chemteacher/index.php?option=com_content&view=article&id=103
- https://www.boundless.com/chemistry/textbooks/boundless-chemistry-textbook/periodic-properties-8/variation-in-chemical-properties-70/the-halogens-group-17-329-851/
- https://www.google.com/search?q=interesting+facts+about+group+17+on+the+periodic+table&espv=2&biw=1366&bih=604&source=lnms&tbm=isch&sa=X&ved=0CAYQ_AUoAWoVChMIgOeVzfOZyAIVAeqACh0cGgVt&dpr=1
- http://www.chemicalelements.com/groups/halogens.html
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