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caesium
XDict
n
. 銫[金屬元素]
PyDict
銫[金屬元素]
WordNet
(
r
)
3
.
0
(
2006
) (
WordNet
)
caesium
n
1
:
a
soft
silver
-
white
ductile
metallic
element
(
liquid
at
normal
temperatures
);
the
most
electropositive
and
alkaline
metal
[
synonym
: {
cesium
}, {
caesium
}, {
Cs
}, {
atomic
number
55
}]
The
Collaborative
International
Dictionary
of
English
v
.
0
.
48
(
gcide
)
caesium
\
caesium
\,
Caesium
\
C
[
ae
]"
si
*
um
\(
s
[=
e
]"
z
[-
e
]*[
u
^]
m
),
n
.
[
NL
.,
from
L
.
caesius
bluish
gray
.] (
Chem
.)
A
rare
alkaline
metal
found
in
mineral
water
; --
so
called
from
the
two
characteristic
blue
lines
in
its
spectrum
.
It
was
the
first
element
discovered
by
spectrum
analysis
,
and
is
the
most
strongly
basic
and
electro
-
positive
substance
known
.
Symbol
Cs
.
Atomic
number
55
.
Atomic
weight
132
.
6
.
Syn
:
cesium
,
Cs
[
1913
Webster
]
The
Elements
Database
(
element
)
caesium
Symbol
:
Cs
Atomic
number
:
55
Atomic
weight
:
132
.
90545
Soft
silvery
-
white
metallic
element
belonging
to
group
1
of
the
periodic
table
.
One
of
the
three
metals
which
are
liquid
at
room
temperature
.
Cs
-
133
is
the
natural
,
and
only
stable
,
isotope
.
Fifteen
other
radioisotopes
exist
.
Caesium
reacts
explosively
with
cold
water
,
and
ice
at
temperatures
above
157K
.
Caesium
hydroxide
is
the
strongest
base
known
.
Caesium
is
the
most
electropositive
,
most
alkaline
and
has
the
least
ionization
potential
of
all
the
elements
.
Known
uses
include
the
basis
of
atomic
clocks
,
catalyst
for
the
hydrogenation
of
some
organic
compounds
,
and
in
photoelectric
cells
.
Caesium
was
discovered
by
Gustav
Kirchoff
and
Robert
Bunsen
in
Germany
in
1860
spectroscopically
.
Its
identification
was
based
upon
the
bright
blue
lines
in
its
spectrum
.
The
name
comes
from
the
latin
word
caesius
,
which
means
sky
blue
.
Caesium
should
be
considered
highly
toxic
.
Some
of
the
radioisotopes
are
even
more
toxic
.
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