Einsteinium Information
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Einsteinium Element
Einsteinium
is a synthetic element with the symbol Es and atomic number 99. As a member of
the actinide series, it is the seventh transuranic element.
Einsteinium
was discovered as a component of the debris of the first hydrogen bomb
explosion in 1952, and named after Albert Einstein. Its most common isotope
einsteinium-253 (half-life 20.47 days) is produced artificially from decay of
californium-253 in a few dedicated high-power nuclear reactors with a total
yield on the order of one milligram per year. The reactor synthesis is followed
by a complex process of separating einsteinium-253 from other actinides and
products of their decay. Other isotopes are synthesized in various
laboratories, but in much smaller amounts, by bombarding heavy actinide
elements with light ions. Owing to the small amounts of produced einsteinium
and the short half-life of its most easily produced isotope, there are
currently almost no practical applications for it outside basic scientific
research. In particular, einsteinium was used to synthesize, for the first
time, 17 atoms of the new element mendelevium in 1955.
Einsteinium
is a soft, silvery, paramagnetic metal. Its chemistry is typical of the late
actinides, with a preponderance of the +3 oxidation state; the +2 oxidation
state is also accessible, especially in solids. The high radioactivity of
einsteinium-253 produces a visible glow and rapidly damages its crystalline
metal lattice, with released heat of about 1000 watts per gram. Difficulty in
studying its properties is due to einsteinium-253's decay to berkelium-249 and
then californium-249 at a rate of about 3% per day. The isotope of einsteinium
with the longest half-life, einsteinium-252 (half-life 471.7 days) would be
more suitable for investigation of physical properties, but it has proven far
more difficult to produce and is available only in minute quantities, and not in
bulk.[1] Einsteinium is the element with the highest atomic number which has
been observed in macroscopic quantities in its pure form, and this was the
common short-lived isotope einsteinium-253.[2]
Like
all synthetic transuranic elements, isotopes of einsteinium are very
radioactive and are considered highly dangerous to health on ingestion.
·
Atomic weight (average mass of the atom): 252
·
Density: Unknown
·
Phase at room temperature: solid
·
Melting point: 1,580 degrees Fahrenheit (860 degrees Celsius)
·
Boiling point: Unknown
·
Number of natural isotopes (atoms of the same element with a
different number of neutrons): 0. There are also at least 19 artificial
isotopes created in a lab, none of which are stable.
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