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

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Tantalum

Tantalum Element Properties

d72
Hf
Hafnium
d73
Ta
Tantalum
d74
W
Tungsten
General
NameTantalum
SymbolTa
Number73
Group Number5
GroupTransition metals
Blockd
Density16.6 g/cm3
Atomic Weight180.947 g/mol
Atomic Volume10.90 cm3/mol
Discover1802


States
StateSolid
Melting Point3290 K
Boiling Point5731 K
Triple PointNil
Critical PointNil
Heat of Fusion36.57 kJ/mol
Heat of Vaporization732.8 kJ/mol


Energies
First Ionization Energy761 kJ/mole
Second Ionization EnergyNil
Third Ionization EnergyNil
Electronegativity1.5
Electron Affinity31.1 kJ/mole
Specific Heat0.14 J/gK
Heat Atomization782 kJ/mole atoms


Oxidation and Electrons
Shells2,8,18,32,11,2
Electron Configuration[Xe] 4f14 5d3 6s2
Minimum Oxidation Number-1
Maximum Oxidation Number5
Minimum Common Oxidation Number0
Maximum Common Oxidation Number5


Appearance and Characteristics
Crystal Structurecubic body centered
Characteristicshard, inert at <100 deg.C
Colorgray
Usessurg. implants,heat exch.
HardnessNil
ToxicityNone


Reactions
Reaction with AirNone
Reaction with 6M HClNone
Reaction with 15M HNO3None
Reaction with 6M NaOHNone


Other Forms
Number of Isotopes2
HydrideTaH
OxideTaO2 Ta2O5
ChlorideTaCl3 TaCl4 TaCl5


Radius
Atomic Radius146 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)86 pm


Conductivity
Thermal Conductivity57.5 J/m-sec-deg
Electrical Conductivity80.321 1/mohm-cm
Polarizability13.1 A3


Abundance
SourceTantalite (oxide)
Relation Abundance Solar System-1.684 log
Abundance Earth's Crust0.3 log


d72
Hf
Hafnium
d73
Ta
Tantalum
d74
W
Tungsten




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