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Additional
plutonium
English Wikipedia - The Free Encyclopedia
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Plutonium
Plutonium
is a
transuranic
radioactive
chemical element
with
symbol
Pu
and
atomic number
94. It is an
actinide
metal
of silvery-gray appearance that
tarnishes
when exposed to air, and forms a dull coating when
oxidized
. The element normally exhibits six
allotropes
and four
oxidation states
. It reacts with
carbon
,
halogens
,
nitrogen
,
silicon
and
hydrogen
. When exposed to moist air, it forms
oxides
and
hydrides
that expand the sample up to 70% in volume, which in turn flake off as a powder that is
pyrophoric
. It is
radioactive
and can accumulate in
bones
, which makes the handling of plutonium dangerous.
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