http://www.britannica.com/biography/William-Ramsay
http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1904/
http://chemwiki.ucdavis.edu/Core/Inorganic_Chemistry/Descriptive_Chemistry/Elements_Organized_by_Block/2_p-Block_Elements/Group_18%3A_The_Noble_Gases/1Group_18%3A_Properties_of_Nobel_Gases
https://www.boundless.com/chemistry/textbooks/boundless-chemistry-textbook/periodic-properties-8/variation-in-chemical-properties-70/the-noble-gases-group-18-330-1854/
http://www.britannica.com/science/noble-gas
http://www.chemicalelements.com/groups/noblegases.html
http://chemistry.about.com/od/elementgroups/a/noblegases.htm
(Images were taken from the internet from many sources)
http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1904/
http://chemwiki.ucdavis.edu/Core/Inorganic_Chemistry/Descriptive_Chemistry/Elements_Organized_by_Block/2_p-Block_Elements/Group_18%3A_The_Noble_Gases/1Group_18%3A_Properties_of_Nobel_Gases
https://www.boundless.com/chemistry/textbooks/boundless-chemistry-textbook/periodic-properties-8/variation-in-chemical-properties-70/the-noble-gases-group-18-330-1854/
http://www.britannica.com/science/noble-gas
http://www.chemicalelements.com/groups/noblegases.html
http://chemistry.about.com/od/elementgroups/a/noblegases.htm
(Images were taken from the internet from many sources)