73
Ta
Tantalum
180.947882
Basic Information
Bohr Model
Descriptive Numbers
Mass
Periodic Position
Classification
Abundance
Color
Atomic Radius
Temperature
Density
Heat
Speed of Sound
Electrical Resistance
Magnetic Properties
Elasticity
Hardness
Etymology
Discovery & Isolation
Production & Use
Radioactivity
Electron Affinity
Dipole Polarity
Lattice
Electron & Quantum
List of Compounds
Basic Information
Bohr Model
Static
Interactive
Descriptive Numbers
CAS Number
7440-25-7
CID Number
CID23956
DOT Number
3089
RTECS Number
RTECSWW5505000
Mendeleev Number
49
Pettifor Number
53
Space Group Number
229
Glawe Number
52
Mass
Atomic Mass
180.947882 Da
Uncertainty
0.00002
Periodic Position
X Position
5
Y Position
6
Period
6
Group
5
Classification
Block
d
Category
Transition Metal
Geochemical
High Field Strength
Goldschmidt
Lithophilic
Electrical Type
Conductive
Abundance
Urban Soil
0.0015 mg/kg
Seawater
2e-12 kg/L
Earth Crust
0.000002 g
Solar System
3.8e-8 mole ratio to silicon
Meteorites
0.000002 %
Color
Jmol
#4DA6FF
Molcas Gv
#4DA6FF
CPK
#FF1493
Atomic Radius
Empirical
145
Calculated
200
Batsanov
220
Rahm
258
Uff
317
Mm3
243
Alvarez
253
Covalent (Single Bound)
138
Covalent (Triple Bound)
119
Covalent (Cordero)
170
Covalent (Pyykko)
146
Covalent (Pyykko Double)
126
Covalent (Pyykko Triple)
119
Mendeleev
134
C12
146
Metallic
146
Temperature
Melting/Freeze (USE)
3290 °K
Melting/Freeze (WEL)
3290 °K
Melting/Freeze (CRC)
3290 °K
Melting/Freeze (LNG)
3269 °K
Boiling/Density (USE)
5731 °K
Boiling/Density (WEL)
5731 °K
Boiling/Density (CRC)
5731 °K
Boiling/Density (LNG)
5702 °K
Boiling/Density (Zhang)
5693 °K
Superconducting Point
4.47 °K
Density
STP
16.69 kg/cm³
Solid (WEL)
16650 kg/cm³
Solid (CRC)
16400 kg/cm³
Solid (LNG)
16690 kg/cm³
Liquid (CR2)
15000 kg/cm³
Heat
Molar Volume
10.85 cm³/mol
Atomic Volume
10.9 cm³
Heat Of Fusion USE
24.7 kJ/mol
Heat Of Fusion CRC
36.57 kJ/mol
Heat Of Fusion LNG
36.57 kJ/mol
Heat Of Fusion WEL
36 kJ/mol
Evaporation USE
758 kJ/mol
Evaporation LNG
732.8 kJ/mol
Evaporation WEL
735 kJ/mol
Evaporation Zhang
753 kJ/mol
Molar Heat
25.36 J/molK
Heat Capacity USE
0.14 J/gK
Heat Capacity CRC
25.36 J/gK
Heat Capacity LNG
25.4 J/gK
Heat Capacity WEL
25.4 J/gK
Thermal Conductivity
57.5 W/m*K
Thermal Expansion
0.0000063 1/K
Adiabatic Index
N/A
Speed of Sound
Extensional
3400 m/s
Electrical Resistance
80k
26.2 nΩm
273k
122 nΩm
293k
131 nΩm
298k
134 nΩm
300k
135 nΩm
500k
229 nΩm
Magnetic Properties
Order
paramanyetic
Susceptibility
1.1e-8 m3/kg
Elasticity
Shear Modulus
69 GPa
Bulk Modulus
200 GPa
Poisson Ratio
0.34 ν
Youngs Modulus
186 GPa
Hardness
Mohs
6.5
Brinell
441-3430
Vickers
873–1200
Etymology
Description
It is a heavy, blue-grey transition metal. Ta-181 is a stable and radioactive isotope of Ta-180 with a half-life of more than 10^7 years. It is used in the surgical field because it is non-reactive. It forms a passive oxide layer in the air. It was discovered by Ekeberg in 1802 and isolated by Jons J. Berzelius in 1820.
Language Of Origin
Greek
Origin Of Word
From King Tantalus, father of Niobe in Greek mythology
Meaning
Tantalus, possibly meaning "bearer" or "suffering"
Symbol Origin
mythological
Etymological Description
From Tantalus, who in Greek mythology was sentenced to stand knee-deep in a lake after his death. If he bent down to drink from the lake water, the water receded beyond his reach. This has been likened to the general unreactivity (i.e. "unaccessibility") of the element tantalum due to its inertness.
Discovery & Isolation
Observed/Predicted By
G. Ekeberg
Observed/Discovery Year
1802
Discovery Location
Production & Use
Sources
It is mostly found in the tantalite mineral. It is always found together with niobium.
Uses
It is widely used as an economical alternative to platinum. Tantalum pentoxide is used in capacitors and camera lenses to increase refractive power. Both it and its alloys are resistant to abrasion and water. That's why it is used in surgical and dental materials.
Radioactivity
Half Life
Stable
Lifetime
Stable
Neutron Mass Absorption
0.0041
Neutron Cross Section
20.5
Electron Affinity
Electron Affinity (eV)
0.322
Electron Affinity (kJ/mol)
31
Electron Affinity (pauling)
1.5
Electron Affinity (allen)
7.93
Electron Affinity (ghosh)
0.234581
Dipole Polarity
Accepted
74
Uncertainty
20
C6 GB
887
Lattice
Constant Internal Default Radius
3.31
Strucutre
BCC
Angles
p/2, p/2, p/2
Electron & Quantum
Oxidation States
−3,−1,0,1,2,3,4,5
Electron Configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d3
Quantum Number
4F3/2
Electron Configuration Semantic
[Rook] 4f14 5d3 6s2
Shells-0
2
Shells-1
8
Shells-2
18
Shells-3
32
Shells-4
11
Shells-5
2
Ionization Energies-0
761
Ionization Energies-1
1500
List of Compounds
1-10 of 34 compounds
| Formula | Names |
|---|---|
| Ta | tantalum tantalum metal |
| Al3Ta | tantalum aluminide |
| TaB | tantalum boride boranylidynetantalum tantalum monoboride |
| TaBr5 | tantalum(V)bromide pentabromotantalum |
| Cl3Ta | tantalum(III) chloride |
| Cl4Ta | tantalum(IV) chloride |
| TaCl5 | tantalum(V) chloride pentachlorotantalum tantalum chloride tantalum pentachloride |
| TaF5 | tantalum(V) fluoride pentafluorotantalum tantalum fluoride tantalum pentafluoride |
| TaI5 | tantalum(V)iodide tantalum(+5) cation pentaiodide |
| TaN | tantalum nitride azanylidynetantalum nitridotantalum nitrilotantalum tantalum mononitride |
