Xenon

 (Xe),   chemical element, heavy and extremely rare gas of Group 0 (noble gases) of the periodic table. It was the first noble gas found to form true chemical compounds. More than 4 1/2 times heavier than air, xenon is colourless, odourless, and tasteless. Solid xenon belongs to the face-centred cubic crystal system, which implies that its molecules, which consist of single atoms, behave