Hafnium is element 72, a transition metal of the d block, in group 4, period 6. Its ground-state configuration is [Xe] 4f14 5d2 6s2, and it usually shows the oxidation states 0, 4.
It was discovered in 1923, by Coster and George de Hevesy.
Name origin: Hafnia, the New Latin name for Copenhagen.
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