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thallium 音標拼音: [θ'æliəm]
XDict
n
. 稀金屬元素,鉈符號
Ti
,原子序
81
PyDict
稀金屬元素,鉈符號
Ti
,原子序
81
WordNet
(
r
)
3
.
0
(
2006
) (
WordNet
)
thallium
n
1
:
a
soft
grey
malleable
metallic
element
that
resembles
tin
but
discolors
on
exposure
to
air
;
it
is
highly
toxic
and
is
used
in
rodent
and
insect
poisons
;
occurs
in
zinc
blende
and
some
iron
ores
[
synonym
: {
thallium
}, {
Tl
}, {
atomic
number
81
}]
The
Collaborative
International
Dictionary
of
English
v
.
0
.
48
(
gcide
)
Thallium
\
Thal
"
li
*
um
\,
n
. [
NL
.,
fr
.
Gr
. ?
young
or
green
shoot
or
branch
,
twig
.
So
called
from
a
characteristic
bright
green
line
in
its
spectrum
.] (
Chem
.)
A
rare
metallic
element
of
the
aluminium
group
found
in
some
minerals
,
as
certain
pyrites
,
and
also
in
the
lead
-
chamber
deposit
in
the
manufacture
of
sulphuric
acid
.
It
is
isolated
as
a
heavy
,
soft
,
bluish
white
metal
,
easily
oxidized
in
moist
air
,
but
preserved
by
keeping
under
water
.
Symbol
Tl
.
Atomic
weight
203
.
7
.
[
1913
Webster
]
The
Elements
Database
(
element
)
thallium
Symbol
:
Tl
Atomic
number
:
81
Atomic
weight
:
204
.
3833
Pure
,
unreacted
thallium
appears
silvery
-
white
and
exhibits
a
metallic
lustre
.
Upon
reacting
with
air
,
it
begins
to
turn
bluish
-
grey
and
looks
like
lead
.
It
is
very
malleable
,
and
can
be
cut
with
a
knife
.
There
are
two
stable
isotopes
,
and
four
radioisotopes
,
Tl
-
204
being
the
most
stable
with
a
half
-
life
of
3
.
78
years
.
Thallium
sulphate
was
used
as
a
rodenticide
.
Thallium
sulphine
'
s
conductivity
changes
with
exposure
to
infrared
light
,
this
gives
it
a
use
in
infrared
detectors
.
Discovered
by
Sir
William
Crookes
via
spectroscopy
.
Its
name
comes
from
the
Greek
word
thallos
,
which
means
green
twig
.
Thallium
and
its
compounds
are
toxic
and
can
cause
cancer
.
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