Definition of Es
n.
1.
the
chemical
symbol
for
einsteinium
,
a
transuranic
element
with
atomic
number
99.
The
atomic
weight
of
the
longest-lived
isotope
,
with
a
half-life
of
276
days
,
is
254
.
The
first
isotope
discovered
,
having
atomic
weight
253
and
a
half-life
of
20
days
,
was
recognized
in
1952
in
the
debris
from
a
hydrogen
bomb
test
.
As
much
as
3
micrograms
of
einsteinium
were
produced
by
a
complex
process
involving
long
irradiation
of
plutonium
isotopes
in
nuclear
reactors
.
Its
chemical
properties
are
those
of
a
trivalent
actinide
element
.
Related Words
atomic
number
99,
E
,
einsteinium
,
metal
,
metallic
element
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