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Hafnium
Hafnium
is a
chemical element
with
symbol
Hf
and
atomic number
72. A
lustrous
, silvery gray,
tetravalent
transition metal
, hafnium chemically resembles
zirconium
and is found in zirconium
minerals
. Its existence was
predicted by Dmitri Mendeleev
in 1869, though it was not identified until 1923, making it the penultimate
stable
element to be discovered (
rhenium
was identified two years later). Hafnium is named after
Hafnia
, the
Latin
name for Copenhagen, where it was discovered.
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