atomic number 72
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atomic number 72 Definition
(n)
a
gray
tetravalent
metallic
element
that
resembles
zirconium
chemically
and
is
found
in
zirconium
minerals
;
used
in
filaments
for
its
ready
emission
of
electrons
atomic number 72 Synonyms
atomic number 72
hafnium
Hf
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