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#hafnium
#transition metal
#element 72
#atomic number 72
#hf
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#hafnium
#nuclear control rod
#neutron absorber
#element 72
#atomic number 72
#hf uses
#nuclear reactor
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#hafnium
#copenhagen
#hafnia
#element 72
#atomic number 72
#hafnium #transition metal #element 72 #atomic number 72 #hf