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Hafnium

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Hafnium
178.49(2)



  Hf
72
1s22s22p63s23p63d104s24p6 4d105s25p64f145d26s2
[ ? ] Transition metal:
Properties:
Shiny, steel gray, ductile metal.
Hazard:
Pyrophoric and will ignite spontaneously in the air.


Hafnium is a chemical element, having the chemical symbol Hf. Its atomic number (the number of protons) is 72. It has a standard atomic weight of 178.49 g•mol −1 and is a solid in its elemental form.

Hafnium is considered a member of the "Transition metal" class of elements. At a pressure of 101.325 kPa, it has a boiling point of 4,603°C and a melting point of 2,233 °C.