The noble gases are a group of elements that are all gases. These elements are all in Group 18 of the periodic table. They almost never react with other elements. This is because they have a full outer electron shell. There are six noble gases:
When the noble gases are used in cold cathode tubes to produce light, each of them has a different colour. Since Radon is radioactive, it is usually not used for lighting. Here are pictures of what the others look like:
Noble gases were discovered by Lord Rayleigh and Sir William Ramsay. Rayleigh won the Nobel Prize in Physics in 1904 for his work on noble gas. Ramsay won the Nobel Prize in Chemistry in 1904 for his work with noble gas.
- Ozima, Minoru; Podosek, Frank A. (2002). Noble Gas Geochemistry. Cambridge University Press. ISBN 0-521-80366-7. http://books.google.com/?id=CBM2LJDvRtgC.
- "Rayleigh, John William Strutt, 3rd Baron". from Chambers Biographical Dictionary. 2007. http://www.credoreference.com/entry.do?id=8042959. Retrieved 30 July 2011.
- "Ramsay, Sir William". Chambers Biographical Dictionary. 2007. http://www.credoreference.com/entry/chambbd/ramsay_sir_william. Retrieved 30 July 2011.