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neptunium 音标拼音: [nɛpt'uniəm]
XDict
n
. 镎
PyDict
□
WordNet
(
r
)
3
.
0
(
2006
) (
WordNet
)
neptunium
n
1
:
a
radioactive
transuranic
metallic
element
;
found
in
trace
amounts
in
uranium
ores
;
a
by
-
product
of
the
production
of
plutonium
[
synonym
: {
neptunium
}, {
Np
}, {
atomic
number
93
}]
The
Collaborative
International
Dictionary
of
English
v
.
0
.
48
(
gcide
)
Neptunium
\
Nep
*
tu
"
ni
*
um
\,
n
. [
NL
.]
A
radioactive
metallic
element
of
atomic
number
93
,
produced
in
nuclear
reactors
from
Plutonium
or
Uranium
.
Symbol
Np
;
The
atomic
weight
of
the
most
stable
isotope
is
237
.
0482
.
[
PJC
]
The
Elements
Database
(
element
)
neptunium
Symbol
:
Np
Atomic
number
:
93
Atomic
weight
: (
237
)
Radioactive
metallic
transuranic
element
,
belongs
to
the
actinoids
.
Np
-
237
,
the
most
stable
isotope
,
has
a
half
-
life
of
2
.
2
*
10
^
6
years
and
is
a
by
product
of
nuclear
reactors
.
The
other
known
isotopes
have
mass
numbers
229
through
236
,
and
238
through
241
.
Np
-
236
has
a
half
-
life
of
5
*
10
^
3
years
.
First
produced
by
Edwin
M
.
McMillan
and
P
.
H
.
Abelson
in
1940
.
English
-
German
(
Internet
Dictionary
Project
)
Neptunium
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