Iridium Ir
Atomic Number: 77
Atomic Mass: 192.22
State of Matter: Solid
Color: Silvery
Element Group Name: Metal
Boiling Point: 8,132 degrees F
Melting Point: 4,442 degrees F
Atomic Mass: 192.22
State of Matter: Solid
Color: Silvery
Element Group Name: Metal
Boiling Point: 8,132 degrees F
Melting Point: 4,442 degrees F
Sites;http://periodictable.com/Samples/077.4/s9s.JPG
Iridium is named after the Latin word iris meaning rainbow. Iridium has many uses such as: tip of gold pens, compass bearings, surgical pins and *pivots. Iridium was discovered in 1804 by Smithson Tenant. He discovered it in the residue left from crude Platinum. Iridium is already an extremely fascinating element but on top of that it is one of the most corrosion resistant metals know!
*Pivots are the central point, pin, or shaft on which a mechanism turns.
Protons = 77
Electrons = 77
Neutrons = 115
http://www.chemicalelements.com/bohr/b0077.gif
Fun Facts!
1. When Iridium was discovered it was not the only element discovered at that time. Another element that was discovered by the same person (Smithson Tenant) was Osmium.
2. Meteors and asteroids contain high amounts of Iridium.
3. A thin worldwide layer of Iridium indicates that around the end of the Cretaceous period that at some point in time a large meteor or asteroid did hit Earth.
Iridium was discovered in the United Kingdom in London.
Works Cited
_____________________________________________________________________
Emsley, John. "Iridium." - Element Information, Properties and Uses. Murray Robertson, 2011. Web. 15 Mar. 2013.
Gagnon, Steve. "The Element Iridium." It's Elemental -. Thomas Jefferson National Accelerator Facility, 20 Mar. 2013. Web. 20 Mar. 2013.
Stwertka, Albert. "Iridium." A Guide to the Elements. New York: Oxford UP, 1996. 174-75. Print.
"iridium." Compton's by Britannica. Encyclopædia Britannica Online School Edition.
Encyclopædia Britannica, Inc., 2013. Web. 20 Mar. 2013.
Works Cited
_____________________________________________________________________
Emsley, John. "Iridium." - Element Information, Properties and Uses. Murray Robertson, 2011. Web. 15 Mar. 2013.
Gagnon, Steve. "The Element Iridium." It's Elemental -. Thomas Jefferson National Accelerator Facility, 20 Mar. 2013. Web. 20 Mar. 2013.
Stwertka, Albert. "Iridium." A Guide to the Elements. New York: Oxford UP, 1996. 174-75. Print.
"iridium." Compton's by Britannica. Encyclopædia Britannica Online School Edition.
Encyclopædia Britannica, Inc., 2013. Web. 20 Mar. 2013.