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Xenon (Xe). Diagram of the nuclear composition, electron configuration, chemical data, and valence orbitals of an atom of xenon-131 (atomic number: 54
Xenon (Xe). Diagram of the nuclear composition, electron configuration, chemical data, and valence orbitals of an atom of xenon-131 (atomic number: 54), an isotope of this element. The nucleus consists of 54 protons (red) and 77 neutrons (orange). 54 electrons (white) occupy shells (rings); eight fill the outer (fifth) electron shell in what is a very stable configuration. The stability of an element's outer (valence) electrons determines its chemical and physical properties. Xenon is a noble gas in group 18, period 5, and the p-block of the periodic table. An inert gas found in trace amounts in the atmosphere, it is used in flash lamps and lasers.
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Photo credit: © CARLOS CLARIVAN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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