Argon

ARGON
 * Symbol:** Ar
 * Atomic Number:** 18
 * Atomic Mass:** 39.948 amu
 * Melting Point:** -189.3 °C (83.85 K, -308.74 °F)
 * Boiling Point:** -186.0 °C (87.15 K, -302.8 °F)
 * Number of Protons/Electrons:** 18
 * Number of Neutrons:** 22
 * Classification:** [|__Noble Gas__]
 * Crystal Structure:** Cubic
 * Density @ 293 K:** 1.784 g/cm 3
 * Color:** Colorless Gas
 * Group:** 18
 * Period:** 3


 * DISCOVERY**

**Date of Discovery:** 1894 Argon was discovered in scotland.
 * Discoverer:** Sir William Ramsay
 * Name Origin:** From the Greek word //argon// (inactive) [[image:william_ramsey.png align="right"]]
 * Uses:** Lighting
 * Obtained From:** air
 * no ions**


 * USES OF ARGON -lighting, dating rocks,radio tubes, arc-welding like aluminum and stainless steal **
 * INTERESTING FACT**

Works Cited "Argon." //World Book//. Student ed. 2009. //World Book Online//. Web. 22 Nov. 2009. "periodic table of elements." //Prairie Hills Student hand book 2009 2010// Aug. 2009: 109. Print. unknown. //Argon//. N.d. unknown, unknown. //google images//. Web. 30 Nov. 2009. unknown. //Sir william Ramsay//. N.d. unknown, unknown. //Sir William Ramsay//. Web. 30 Nov. 2009.

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