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.