Chemicool
Ta
73
180.947
Tantalum
General
|
States
|
Energies
|
Oxidation & Electrons
|
Appearance & Characteristics
Reactions
|
Other Forms
|
Radius
|
Conductivity
|
Abundance
Encyclopedia Britannica articles
General
Name
Tantalum
Symbol
Ta
atomic number
73
Atomic weight
180.947
Density @ 293 K
16.6 g/cm3
Atomic volume
10.90 cm3/mol
Group
Trans. Met.
discovered
1802
States
state (s, l, g)
s
melting point
3269.2 K
boiling point
5807 K
Heat of fusion
31.60 kJ/mol
Heat of vaporization
743.0 kJ/mol
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Energies
1st ionization energy
761 kJ/mole
electronegativity
1.5
2nd ionization energy
kJ/mole
electron affinity
31.1 kJ/mole
3rd ionization energy
kJ/mole
Specific heat
0.14 J/gK
heat atomization
782 kJ/mole atoms
Oxidation & Electrons
Shells
2,8,18,32,11,2
electron configuration
[Xe] 4f14 5d3 6s2
minimum oxidation number
-1
maximum oxidation number
5
min. common oxidation no.
0
max. common oxidation no.
5
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Appearance & Characteristics
structure
bcc: body-centered cubic
color
gray
uses
surg. implants,heat exch.
toxicity
hardness
mohs
characteristics
hard, inert at <100 /td deg.c>
Reactions
reaction with air
none
reaction with 6M HCl
none
reaction with 6M HCl
none
reaction with 15M HNO3
none
reaction with 6M NaOH
none
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Other Forms
number of isotopes
2
hydride(s)
TaH
oxide(s)
TaO2 Ta2O5
chloride(s)
TaCl3 TaCl4 TaCl5
Radius
ionic radius (2- ion)
pm
ionic radius (1- ion)
pm
atomic radius
146 pm
ionic radius (1+ ion)
pm
ionic radius (2+ ion)
pm
ionic radius (3+ ion)
86 pm
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Conductivity
thermal conductivity
57.5 J/m-sec-deg
electrical conductivity
80.321 1/mohm-cm
polarizability
13.1 A^3
Abundance
source
Tantalite (oxide)
rel. abund. solar system
-1.684 log
abundance earth's crust
0.3 log
cost, pure
120 $/100g
cost, bulk
$/100g
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