Atomic # 18 Argon (Ar) Atomic Mass: 39.948 amu Isotopes: Isotope Protons Neutrons Electrons Ar-36 36 4 36 Ar-37 37 3 37 Ar-38 38 2 38 Ar-39 39 1 39 Group #: 18 Noble Gases Type of Element: Gas History: It’s presence in the air was Suspected by Cavendish in 1785. It was Discovered 1894 by Sir William Ramsey and Lord Raleigh. °°°°°°°° Boiling Point: -185.7 °C, 87.3 K, -302.3 °F Melting Point: -189.5 °C, 83.85 K, -308.74 °F Density: 1.7824 g/L Physical And Chemical Properties: color less, odor less, crystal structure: cubic, has about the …showed first 75 words of 152 total…

…showed last 75 words of 152 total…as oxygen, heat of vaporization: 6.447kJ/mol How You Get Argon: Argon is isolated by removing nitrogen, oxygen, carbon dioxide and water form the air. Where Argon is Found: Argon makes up 1% of the air. Origin of the Name and Symbol: Argon comes form the Latin word argon and so does the symbol. Uses: Argon is used for lighting. Mainly in neon lights. It provides an inert atmosphere. Also it is used in “Geiger counters”.