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cerium
XDict
n
. 鈰
PyDict
鈰
WordNet
(
r
)
3
.
0
(
2006
) (
WordNet
)
cerium
n
1
:
a
ductile
grey
metallic
element
of
the
lanthanide
series
;
used
in
lighter
flints
;
the
most
abundant
of
the
rare
-
earth
group
[
synonym
: {
cerium
}, {
Ce
}, {
atomic
number
58
}]
The
Collaborative
International
Dictionary
of
English
v
.
0
.
48
(
gcide
)
Cerium
\
Ce
"
ri
*
um
\,
n
. [
Named
by
Berzelius
in
1803
from
the
asteroid
Ceres
,
then
just
discovered
(
1801
).] (
Chem
.)
A
rare
metallic
element
,
occurring
in
the
minerals
cerite
,
allanite
,
monazite
,
etc
.
Symbol
Ce
.
Atomic
weight
141
.
5
.
It
resembles
iron
in
color
and
luster
,
but
is
soft
,
and
both
malleable
and
ductile
.
It
tarnishes
readily
in
the
air
.
[
1913
Webster
]
The
Elements
Database
(
element
)
cerium
Symbol
:
Ce
Atomic
number
:
58
Atomic
weight
:
140
.
12
Silvery
metallic
element
,
belongs
to
the
lanthanoids
.
Four
natural
isotopes
exist
,
and
fifteen
radioactive
isotopes
have
been
identified
.
Used
in
some
rare
-
earth
alloys
.
The
oxidized
form
is
used
in
the
glass
industry
.
Discovered
by
Martin
.
H
.
Klaproth
in
1803
.
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