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請輸入英文單字,中文詞皆可:
plutonium 音標拼音: [plut'oniəm]
XDict
n
. 钚
PyDict
□
WordNet
(
r
)
3
.
0
(
2006
) (
WordNet
)
plutonium
n
1
:
a
solid
silvery
grey
radioactive
transuranic
element
whose
atoms
can
be
split
when
bombarded
with
neutrons
;
found
in
minute
quantities
in
uranium
ores
but
is
usually
synthesized
in
nuclear
reactors
;
13
isotopes
are
known
with
the
most
important
being
plutonium
239
[
synonym
: {
plutonium
},
{
Pu
}, {
atomic
number
94
}]
The
Elements
Database
(
element
)
plutonium
Symbol
:
Pu
Atomic
number
:
94
Atomic
weight
: (
242
)
Dense
silvery
radioactive
metallic
transuranic
element
,
belongs
to
the
actinoids
.
Pu
-
244
is
the
most
stable
isotope
with
a
half
-
life
of
7
.
6
*
10
^
7
years
.
Thirteen
isotopes
are
known
.
Pu
-
239
is
the
most
important
,
it
undergoes
nuclear
fission
with
slow
neutrons
and
is
hence
important
to
nuclear
weapons
and
reactors
.
Plutonium
production
is
monitored
down
to
the
gram
to
prevent
military
misuse
.
First
produced
by
Gleen
T
.
Seaborg
,
Edwin
M
.
McMillan
,
J
.
W
.
Kennedy
and
A
.
C
.
Wahl
in
1940
.
English
-
Spanish
(
Internet
Dictionary
Project
)
plutonio
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