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Hafnium Element Properties, Transition metals Group, Periodic Table of the Elements

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Hafnium

Hafnium Element Properties

d71
Lu
Lutetium
d72
Hf
Hafnium
d73
Ta
Tantalum
General
NameHafnium
SymbolHf
Number72
Group Number4
GroupTransition metals
Blockd
Density13.2 g/cm3
Atomic Weight178.49 g/mol
Atomic Volume13.6 cm3/mol
Discover1923


States
StateSolid
Melting Point2506 K
Boiling Point4876 K
Triple PointNil
Critical PointNil
Heat of Fusion27.2 kJ/mol
Heat of Vaporization571 kJ/mol


Energies
First Ionization Energy680 kJ/mole
Second Ionization Energy1440 kJ/mole
Third Ionization Energy2250 kJ/mole
Electronegativity1.3
Electron Affinity0 kJ/mole
Specific Heat0.14 J/gK
Heat Atomization619 kJ/mole atoms


Oxidation and Electrons
Shells2,8,18,32,10,2
Electron Configuration[Xe] 4f14 5d2 6s2
Minimum Oxidation Number0
Maximum Oxidation Number4
Minimum Common Oxidation Number0
Maximum Common Oxidation Number4


Appearance and Characteristics
Crystal Structurehexagonal
Characteristicshard
Colorsilvery
Usesnuclear control rods
HardnessNil
ToxicityNone


Reactions
Reaction with Airmild, w/ht, =>HfO2
Reaction with 6M HClNone
Reaction with 15M HNO3passivated
Reaction with 6M NaOHNone


Other Forms
Number of Isotopes6
HydrideHfH2
OxideHfO2
ChlorideHfCl3 HfCl4


Radius
Atomic Radius159 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 Conductivity23.2 J/m-sec-deg
Electrical Conductivity28.49 1/mohm-cm
Polarizability16.2 A3


Abundance
SourceZircon (silicate)
Relation Abundance Solar System-0.812 log
Abundance Earth's Crust0.4 log


d71
Lu
Lutetium
d72
Hf
Hafnium
d73
Ta
Tantalum




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