Halogens

Halogens: By Ronald Narayan And Andre Dang What is/are Halogen(s)?

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The elements contained in the classification of Halogens are Fluorine  Chlorine   Bromine   Iodine   Astatine
 * “The halogens are five non-metallic elements found in group 17 of the periodic table. The term "halogen" means "salt-former" and compounds containing halogens are called "salts". All halogens have 7 electrons in their outer shells, giving them an oxidation number of -1 ﻿ .” Bentor, Y 2009, //Halogens//, ChemicalElements.com, accessed 11 October 2011, . **======

Ronald Fluorine __ ** Fluorine Image: ** __ " Mueller, B 2011, //A tube with liquid fluorine in a cryogenic bath//, Photograph, Wikimedia Commons, accessed 11 October 2011, ."

Fluorine:
Fluorine is a pale-yellowish colour which is very poisonous and is said to be one of the most reactive elements in the periodic table. The uses of Fluorine are vast In the use of industrial compounds. Some associated uses of fluorine are in; air conditioning, refrigeration, toothpaste, Teflon and the production of uranium. Fluorine forms compounds with all of the elements except helium, neon, and argon. Flourine has two shells which are also known as levels, in the first it has two electrons and in the outer it has a total of seven electrons. "Properties of Fluorine:  Symbol: F   Atomic Number: 9   Atomic Mass: 18.998404   Number of Electrons/Protons: 9   Number of Neutrons: 10"   Bentor, Yinon. __Chemical Element.com - Fluorine__. Oct. 13, 2011 . Bentor, Y 2009, //Fluorine//, Picture, ChemicalElements.com, accessed 11 October 2011, .

Ronald

Chlorine
**__Chlorine Image__** Oelen, W 2008, //Chlorine gas in an ampoule//, Photograph, Chemicalinterest, accessed 13 October 2011, .

Chlorine
Chlorine is a greenish-yellowish gas which is irritating and can form compounds with nearly all other elements. When in its liquid or solid form it is a great bleaching, oxidizing and disinfectant agent. It is also used to purify water. Other associated uses of chlorine are; bleach, antiseptic, paint, plastic, medicines and insecticides. Chlorine has three energy levels, the first having two electrons, the second with eight and the outer (third) with seven. You may notice that both Chlorine and Fluorine have seven electrons in the outer shell even though they have different energy levels. this makes th halogens something different and makes them a group. "Properties of Chlorine:  Symbol: CI   Atomic Number: 17   Atomic Mass: 34.4527   Number of Protons/Electrons: 17   Number of Neutrons: 18" Bentor, Yinon. __Chemical Element.com - Chlorine __. Oct. 13, 2011 .

Bentor, Yinon. __Chemical Element.com - Chlorine__. Oct. 13, 2011 <<span style="color: black; font-family: Arial,sans-serif;"> [] >

Bromine:

Iodine: ===

Ronald Astatine: Astatine Image: Markitell, J 2007, //Astatine//, Photograph, Periodictable.com, accessed 13 October 2011, <http://periodictable.com/Samples/085.4/s13.JPG> The element astatine is a radioactive element which can be very harmful. It is the heaviest of the halogens and can be used in nuclear medicine, radiotherapy of cancers and to help treat certain diseases. Astatine has a total of six energy levels in the halogen group. The first energy level is consisting of two electrons, the second consisting eight, the third with eighteen, fourth with thirty-two, fifth with eighteen and sixth with seven. Which then adds up to a total atomic number of eighty-five. "Properties of Chlorine  Symbol: AT   Atomic Number: 85   Atomic Mass: 210.0   Number of Protons/Electrons: 85   Number of Neutrons: 125”    Bentor, Yinon. __ Chemical Element.com - Astatine __ . Oct. 13, 2011 <http://www.chemicalelements.com/elements/at.html>.      Bentor, Yinon. Chemical Element.com - Astatine. Oct. 13, 2011 < []>

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