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From Wikipedia, the free encyclopedia
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2017 September
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2017 September 2
2017 September 4
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Picture of the day
Hafnium
is a
chemical element
with the symbol Hf and
atomic number
72. A
lustrous
, silvery gray,
tetravalent
transition metal
, hafnium chemically resembles
zirconium
and is found in many zirconium
minerals
. Its existence was
predicted by Dmitri Mendeleev
in 1869, though it was not identified until 1923, making it the last
stable
element to be discovered. Hafnium is named for
Copenhagen
, where it was discovered.
Photograph:
Heinrich Pniok
Archive
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More featured pictures...
Category
:
Wikipedia Picture of the day September 2017
From Wikipedia, the free encyclopedia
<
Template:POTD
Picture of the day archives
:
2017 September
<
2017 September 2
2017 September 4
>
Picture of the day
Hafnium
is a
chemical element
with the symbol Hf and
atomic number
72. A
lustrous
, silvery gray,
tetravalent
transition metal
, hafnium chemically resembles
zirconium
and is found in many zirconium
minerals
. Its existence was
predicted by Dmitri Mendeleev
in 1869, though it was not identified until 1923, making it the last
stable
element to be discovered. Hafnium is named for
Copenhagen
, where it was discovered.
Photograph:
Heinrich Pniok
Archive
–
More featured pictures...
Category
:
Wikipedia Picture of the day September 2017
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