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Meaning of ATOMIC NUMBER 18
WordNet Dictionary
Definition:
[n]
a
colorless
and
odorless
inert
gas
;
one
of
the
six
inert
gases
;
comprises
approximately
1%
of
the
earth
'
s
atmosphere
Websites:
Synonyms:
Ar
,
argon
See Also:
air
,
argonon
,
chemical element
,
element
,
inert gas
,
noble gas
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