Difference between revisions of "Halogen"

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[[File:Halogens.png|thumb|The halogens on the Periodic Table]]
 
[[File:Halogens.png|thumb|The halogens on the Periodic Table]]
The '''halogens '''are the elements making up column 7A (or 17) of the [[periodic table]]. They are [[fluorine]], [[chlorine]], [[bromine]], [[iodine]], astatine, and ununseptium.
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The '''halogens '''are the elements making up column 7A (or 17) of the [[periodic table]]. They are [[fluorine]], [[chlorine]], [[bromine]], [[iodine]], astatine, and tennessine.
  
 
==Elements in the Halogen Group==
 
==Elements in the Halogen Group==
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Astatine, atomic number 85, is still largely unobserved, because of its extreme radioactivity, but the limited studies of it have confirmed that it seems to behave similarly to the other halogens. It is predicted that it would look like a darker, denser, more metallic version of iodine, if it didn't vaporize itself with the heat from its radiation.<ref>http://en.wikipedia.org/wiki/Astatine</ref>
 
Astatine, atomic number 85, is still largely unobserved, because of its extreme radioactivity, but the limited studies of it have confirmed that it seems to behave similarly to the other halogens. It is predicted that it would look like a darker, denser, more metallic version of iodine, if it didn't vaporize itself with the heat from its radiation.<ref>http://en.wikipedia.org/wiki/Astatine</ref>
  
===Ununseptium===
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===Tennessine===
Ununseptium is the placeholder name for element number 117. As of 2015, A total of 15 ununseptium atoms have been created: six when it was first synthesized in 2010, seven in 2012, and two in 2014.
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Tennessine is element number 117. As of 2015, A total of 15 tennessine atoms have been created: six when it was first synthesized in 2010, seven in 2012, and two in 2014.
  
 
==Properties==
 
==Properties==

Revision as of 13:33, 9 December 2016

The halogens on the Periodic Table

The halogens are the elements making up column 7A (or 17) of the periodic table. They are fluorine, chlorine, bromine, iodine, astatine, and tennessine.

Elements in the Halogen Group

Fluorine

Fluorine, atomic number 9, is an extremely reactive, faint yellow gas under standard conditions.

Chlorine

Chlorine, atomic number 17,  is a reactive, faint greenish-yellow gas under standard conditions.

Bromine

Bromine, atomic number 35, is a reactive, volatile, reddish brown liquid under standard conditions.

Iodine

Iodine, atomic number 53, is a reactive, volatile, black solid under standard conditions.

Astatine

Astatine, atomic number 85, is still largely unobserved, because of its extreme radioactivity, but the limited studies of it have confirmed that it seems to behave similarly to the other halogens. It is predicted that it would look like a darker, denser, more metallic version of iodine, if it didn't vaporize itself with the heat from its radiation.[1]

Tennessine

Tennessine is element number 117. As of 2015, A total of 15 tennessine atoms have been created: six when it was first synthesized in 2010, seven in 2012, and two in 2014.

Properties

Chemical

The halogens are generally considered to be reactive, because they have 7 valence electrons and react with most other elements under the right conditions. They will also react with each other to form interhalogens. All of the halogens are diatomic.

Physical

All of the halogens are volatile. Fluorine and chlorine exist as gases, while bromine and iodine are readily volatile and release a gas phase. All of them are colored, with the color becoming increasingly darker going down the group.[2]

Safety

The halogens must all be handled with care and proper personal protective equipment: rubber gloves, a respirator or gas mask (if not using a fume hood), and a lab apron or lab coat. They are toxic, corrosive, and volatile substances. Use of a fume hood is highly recommended. Fluorine should simply not be used in an amateur setting, because it will kill you more likely than not. Iodine is not subject to many of these precautions. See the safety section of each halogen's page for more specific details.

References

  1. http://en.wikipedia.org/wiki/Astatine
  2. http://en.wikipedia.org/wiki/Halogen

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