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atomic number 18 (0 synonym found)
Definition of atomic number 18:
(n) :
a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
Definition of atomic number 18:
(n) :
a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
A make the world a better place giveback project.
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