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lutetium
XDict
n
. 镥
PyDict
□
WordNet
(
r
)
3
.
0
(
2006
) (
WordNet
)
lutetium
n
1
:
a
trivalent
metallic
element
of
the
rare
earth
group
;
usually
occurs
in
association
with
yttrium
[
synonym
:
{
lutetium
}, {
lutecium
}, {
Lu
}, {
atomic
number
71
}]
The
Collaborative
International
Dictionary
of
English
v
.
0
.
48
(
gcide
)
Lutetium
\
Lu
*
te
"
ti
*
um
\,
n
. (
Chem
.)
A
metallic
element
separated
from
ytterbium
in
1907
,
by
Urbain
in
Paris
and
by
von
Welsbach
in
Vienna
.
It
is
a
member
of
the
Lanthanide
rare
earth
group
.
Symbol
,
Lu
;
atomic
number
71
;
atomic
weight
174
.
967
[
C
=
12
.
011
].
Previously
spelled
{
Lutecium
}.
[
Webster
1913
Suppl
.
PJC
]
The
Elements
Database
(
element
)
lutetium
Symbol
:
Lu
Atomic
number
:
71
Atomic
weight
:
194
.
967
Silvery
-
white
rare
-
earth
metal
which
is
relatively
stable
in
air
.
It
happens
to
be
the
most
expensive
rare
-
earth
metal
.
Its
found
with
almost
all
rare
-
earth
metals
,
but
is
very
difficult
to
separate
from
other
elements
.
Least
abundant
of
all
natural
elements
.
Used
in
metal
alloys
,
and
as
a
catalyst
in
various
processes
.
There
are
two
natural
,
stable
isotopes
,
and
seven
radioisotopes
,
the
most
stable
being
Lu
-
174
with
a
half
-
life
of
3
.
3
years
.
The
separation
of
lutetium
from
{
ytterbium
}
was
described
by
Georges
Urbain
in
1907
.
It
was
discovered
at
approximately
the
same
time
by
Carl
Auer
von
Welsbach
.
The
name
comes
from
the
Greek
word
lutetia
which
means
Paris
.
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