Protons: 18

Electrons: 18

Neutrons: 22

Average Atomic Mass: 39.948 amu

Isotopes: Argon-35, Argon-36, Argon-37, Argon-38, Argon-39, Argon-40, Argon-41, Argon-42, Argon-43, Argon-44

Discovery: Lord Rayleigh and Sir Williams discovered Argon they did this by removing all oxygen and Nitrogen from a sample of air and discovered Argon.

Name:The word Argon comes from the Greek word Argos meaning inactive.

Uses: Used in electric light bulbs and in fluorescent tubes. Its also used in photo tubes, glow tubes, and as an inert gas shield for arc welding and cutting. Argon can be used as a blanket for the production of titanium and other reactive elements. Argon is also used in lasers like shown in the picture.

Interesting Facts: Argon is an element with no color and has no odor to it. It is very inert and is not known to form true chemical compounds. It makes a good atmosphere for working with air-sensitive materials since it is heavier than air and less reactive that Nitrogen. Argon is present to a small extent in the Earth's atmosphere and is obtained as a byproduct from the liquefaction and separation of air. Its presence in air was suspected by Cavendish in 1785, discovered by Lord Rayleigh and Sir William Ramsay in 1894.