Diagram of the nuclear composition, electron configuration, and valence orbitals of an atom of argon-40 (atomic number: 18), the most common terrestri
Diagram of the nuclear composition, electron configuration, and valence orbitals of an atom of argon-40 (atomic number: 18), the most common terrestrial isotope of this element. The nucleus consists of 18 protons (blue) and 22 neutrons (red). The stability of an element's outer (valence) electrons determines its chemical and physical properties. Argon is a noble gas in group 18, period 3, and the p-block of the periodic table. An inert gas formed from the decay of potassium-40, it is used in fluorescent lighting and lasers.
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Photo credit: © CARLOS CLARIVAN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
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