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berkelium
XDict
n
. 放射性元素,符號
Bk
,原子序為
98
PyDict
放射性元素,符號
Bk
,原子序為
98
WordNet
(
r
)
3
.
0
(
2006
) (
WordNet
)
berkelium
n
1
:
a
radioactive
transuranic
element
;
discovered
by
bombarding
americium
with
helium
[
synonym
: {
berkelium
}, {
Bk
}, {
atomic
number
97
}]
The
Collaborative
International
Dictionary
of
English
v
.
0
.
48
(
gcide
)
berkelium
\
ber
*
ke
"
li
*
um
\ (
b
[~
e
]
r
*
k
[=
e
]"
l
[-
e
]*[
u
^]
m
),
n
. [
from
the
city
of
Berkeley
,
California
,
location
of
the
University
of
California
campus
where
it
was
discovered
.]
a
chemical
element
of
the
transuranic
series
.
Chemical
symbol
Bk
;
atomic
number
97
;
atomic
weight
247
.
It
is
a
radioactive
element
,
with
no
stable
isotopes
;
the
longest
-
lived
isotope
is
of
mass
number
247
.
07
,
decaying
by
alpha
-
emission
with
a
half
-
life
of
1
,
400
years
.
The
isotope
with
atomic
weight
249
has
a
half
-
life
of
314
days
,
and
was
isolated
in
weighable
quantities
.
Syn
:
Bk
.
[
WordNet
1
.
5
PJC
]
The
Elements
Database
(
element
)
berkelium
Symbol
:
Bk
Atomic
number
:
97
Atomic
weight
: (
247
)
Radioactive
metallic
transuranic
element
.
Belongs
to
actinoid
series
.
Eight
known
isotopes
,
the
most
common
Bk
-
247
,
has
a
half
-
life
of
1
.
4
*
10
^
3
years
.
First
produced
by
Glenn
T
.
Seaborg
and
associates
in
1949
by
bombarding
americium
-
241
with
alpha
particles
.
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