atomic number 18


  • WordNet 3.6
    • n atomic number 18 a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
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In literature:

The numbers 18, 290 and 261 are the numbers of the ultimate physical atoms found to exist in a chemical atom.
"Occult Chemistry" by Annie Besant and Charles W. Leadbeater

In science:

From the particularly stable structures based on the 18-atom and 49-atom Marks decahedra, it is not surprising that there is another series of magic numbers leading to the 100-atom Marks decahedron.
Identifying structural patterns in `disordered' metal clusters