Yes, hafnium is reactive, but not like sodium or potassium.
Hafnium is a metal, steel grey.
Hafnium is malleable.
Yes it does till it doesn't form and octet fromation. Being a compound and being a cation/anion would help conduct more electrical energy. If the electrons are further from the nucleus means more free, would make it more better.
The density of hafnium is 13,31 g/cm3.
Hafnium is a natural chemical element; hafnium hasn't minerals but it is associated with zirconium (unrefined zirconium contain approx. 2 % hafnium).
Pure hafnium doesn't exist in the nature; hafnium form many compounds.
Fine powders of hafnium are pyrophoric.
There are 37 isotopes of Hafnium.
Hafnium is a metal.
Hafnium is found in tandem with zirconium deposits. It is separated from the zirconium during refinement as hafnium chloride. It is then reduced with magnesium to produce pure hafnium.
Hafnium is a metal, steel grey appearance.
Hafnium is a single element and therefore nonpolar.