Argon

Statistics:

• Name: Argon
• Symbol: Ar
• Classification: Noble Gas
• Atomic Number: 18
• Atomic Mass: 39.948 g/mol
• Density: 1.66 g/cm³
• Melting: -189.4°C
• Boiling: -185.9°C
• Protons & Electrons:18
• Neutrons:22
• Discovered: 1894
• Discovered By: Ramsay and Rayleigh
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Electrons Per Energy Level:

• Level 1: 2
• Level 2: 8
• Level 3: 8

Isotopes:

Isotope: Half-life

• ³⁶Ar: stable
• ³⁷Ar: 35.04 days
• ³⁸Ar: stable
• ³⁹Ar: 269 years
• ⁴⁰Ar: stable
• ⁴¹Ar: 109.34 minutes

Brief Summary

Argon is a Noble Gas with the symbol 'Ar' and contains 18 Protons & Electrons with 22 neutrons in the nucleus of the atom. Argon has an atomic mass of 39.948 g/mol and, at a temperature of 20°C, has a density of 1.66 g/cm³. It will melt at a temperature of -189.4°C and boil at -185.9°C.

Argon was discovered by Ramsay and Rayleigh in 1894 and is named 'Argon' Greek word "argon" meaning "inactive".

Some common usages for Argon: Lighting.

Definitions and Notes

Density listed is at a temperature of 20°C.

Isotopes are forms of an element who have the same atomic number but different mass because they contain different number of neutrons.

Half-life is the time required for a quantity of a subject to fall to half of its current quantity.

MLA Citing Format

Argon :: Ar :: 18 - Chemical Element. 10 Mar. 2010 <http://www.chemicalelement.com/element/argon.html>.