State of Matter(at room temperature): gas
Type of element: metalloid
Color of Element: colorless

. "The Periodic Table." Periodic-Table. N.p., n.d. Web. 16 Nov 2011. <http://www.periodic-table.org.uk/>.

Gagnon, Steve. "Questions and Answers." Jefferson Lab. N.p., n.d. Web. 16 Nov 2011. <http://education.jlab.org/qa/krypton.html>.