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Hafnium (Hf)

Hafnium (Hf) is element 72 of the periodic table, a transition metal in period 6 and group 4. Its standard atomic weight is 178.49, so one mole of hafnium atoms has a mass of 178.49 g. At room temperature it is a solid; it melts at 2232.85 °C and boils at 4602.85 °C.

72 Hf Hafnium 178.49

Period 6, group 4 · Transition metal

← Lu Lutetium Ta Tantalum →

Atomic number	72
Symbol	Hf
Standard atomic weight	178.49
Molar mass	178.49 g/mol
Category	Transition metal
Group	4
Period	6
Block	d-block
Electron configuration	[Xe] 6s² 4f¹⁴ 5d²
Oxidation states	+4
Electronegativity (Pauling)	1.3
Atomic radius (van der Waals)	212 pm
First ionisation energy	6.825 eV (658.5 kJ/mol)
Electron affinity	—
State at room temperature	Solid
Melting point	2506 K (2232.85 °C)
Boiling point	4876 K (4602.85 °C)
Density	13.3 g/cm³
Discovered	1923

Group 4

Ti · Titanium Zr · Zirconium Rf · Rutherfordium

Calculate with Hafnium

Molar mass of Hf Balance an equation Grams, moles and particles Whole periodic table

Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.