Argon

Atomic Number: 18
Symbol: Ar
Atomic Mass: 39.95 u
Number of Neutrons: 22
Melting Point: -189.4°C
Boiling Point: -185.8°C
Electrons per shell: 2.8.8
Ion charge: 0+
Electron configuration: [Ne] 3s² 3p⁶

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Argon is the 18th element and it is a noble gas which means that it is not very reactive. It is a colorless, tasteless and odorless gas. This element is the third most abundant element in the atmosphere at 0.934%. This quite special because most noble gasses can be rare. Oxygen is the 2nd most abundant element in the atmosphere with 21% and nitrogen in first with 78%. Argon is used in fluorescent lights and welding. Argon has 24 known isotopes most almost every argon found is argon-40. The word Argon comes from the greek word for "lazy" because of it's lack of reacting to elements. William Ramsay discovered this element in 1894.

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