Hafnium Element Properties

Hafnium

d71
Lu
Lutetium
d72
Hf
Hafnium
d73
Ta
Tantalum
General
Name(Hafnium)
Symbol(Hf)
Number(72)
Group Number(4)
Group(Transition metals)
Block(d)
Density(13.2 g/cm3)
Atomic Weight(178.49 g/mol)
Atomic Volume(13.6 cm3/mol)
Discover(1923)


States
State(Solid)
Melting Point(2506 K)
Boiling Point(4876 K)
Triple Point(Nil)
Critical Point(Nil)
Heat of Fusion(27.2 kJ/mol)
Heat of Vaporization(571 kJ/mol)


Energies
First Ionization Energy(680 kJ/mole)
Second Ionization Energy(1440 kJ/mole)
Third Ionization Energy(2250 kJ/mole)
Electronegativity(1.3)
Electron Affinity(0 kJ/mole)
Specific Heat(0.14 J/gK)
Heat Atomization(619 kJ/mole atoms)


Oxidation and Electrons
Shells(2,8,18,32,10,2)
Electron Configuration([Xe] 4f14 5d2 6s2)
Minimum Oxidation Number(0)
Maximum Oxidation Number(4)
Minimum Common Oxidation Number(0)
Maximum Common Oxidation Number(4)


Appearance and Characteristics
Crystal Structure(hexagonal)
Characteristics(hard)
Color(silvery)
Uses(nuclear control rods)
Hardness(Nil)
Toxicity(None)


Reactions
Reaction with Air(mild, w/ht, =>HfO2)
Reaction with 6M HCl(None)
Reaction with 15M HNO3(passivated)
Reaction with 6M NaOH(None)


Other Forms
Number of Isotopes(6)
Hydride(HfH2)
Oxide(HfO2)
Chloride(HfCl3 HfCl4)


Radius
Atomic Radius(159 pm)
Ionic Radius (1+ ion)(Nil)
Ionic Radius (1- ion)(Nil)
Ionic Radius (2+ ion)(Nil)
Ionic Radius (2- ion)(Nil)
Ionic Radius (3+ ion)(Nil)


Conductivity
Thermal Conductivity(23.2 J/m-sec-deg)
Electrical Conductivity(28.49 1/mohm-cm)
Polarizability(16.2 A3)


Abundance
Source(Zircon (silicate))
Relation Abundance Solar System(-0.812 log)
Abundance Earths Crust(0.4 log)


d71
Lu
Lutetium
d72
Hf
Hafnium
d73
Ta
Tantalum

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