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    hafnium (Hf)

    hafnium
    Hafnium bolts.
    Image copyright: smart-elements.com
    A hard transition element in group IVB of the periodic table, found in ores of zirconium, which it closely resembles. It is used in nuclear reactor control rods.


    atomic number 72
    relative atomic mass 178.5
    relative density 13.31
    melting point 2,227°C (4,041°F)
    boiling point 4,602°C (8,316°F)


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