'atomic number 18' definitions:
Definition of '
atomic number 18
'
(from
WordNet
)
noun
A colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere [syn:
argon
,
Ar
, atomic number 18]
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
