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atomic number 10
atomic number 100
atomic number 101
atomic number 102
atomic number 103
atomic number 104
atomic number 105
atomic number 106
atomic number 107
atomic number 11
atomic number 12
atomic number 13
atomic number 14
atomic number 15
atomic number 16
atomic number 17
-- atomic number 18 --
atomic number 19
atomic number 2
atomic number 20
atomic number 21
atomic number 22
atomic number 23
atomic number 24
atomic number 25
atomic number 26
atomic number 27
atomic number 28
atomic number 29
atomic number 3
atomic number 30
atomic number 31
atomic number 32
atomic number 18
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Noun
1.
atomic number 18
-
a
colorless
and
odorless
inert
gas
;
one
of
the
six
inert
gases
;
comprises
approximately
1
%
of
the
earth
'
s
atmosphere
Synonyms:
Ar
,
argon
air
,
Ar
,
argon
,
argonon
,
chemical
element
,
element
,
inert
gas
,
noble
gas
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