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Additional
Iron
English Wikipedia - The Free Encyclopedia
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Iron
Iron
is a
chemical element
with symbol
Fe
(from ) and
atomic number
26. It is a
metal
in the
first transition series
. It is by mass the most common element on
Earth
, forming much of Earth's
outer
and
inner core
. It is the fourth most common
element in the Earth's crust
. Its abundance in
rocky planets
like Earth is due to its abundant production by
fusion
in high-mass
stars
, where the production of
nickel-56
(which decays to the most common isotope of iron) is the last
nuclear fusion reaction
that is
exothermic
. Consequently,
radioactive
nickel
is the last element to be produced before the violent collapse of a
supernova
scatters
precursor
radionuclide
of iron into space.
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