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73
Ta
180.947
Tantalum |
Appearance & Characteristics | Reactions |
Other Forms Radius | Conductivity | Abundance
General:
| Name: Tantalum | Symbol: Ta |
| Group: Trans. Met. | 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): solid | |
| Melting point: 3269.2 K | Boiling point: 5807 K |
| Heat of fusion: 31.60 kJ/mol | Heat of vaporization: 743.0 kJ/mol |
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 |
Appearance & Characteristics
| Structure: bcc: body-centered cubic | Color: gray |
| Uses: surg. implants,heat exch. | Toxicity: |
| Hardness: mohs | Characteristics: hard, inert at < 100 deg.C |
Reactions
| Reaction with air: none | |
| Reaction with 6 M HCl: none | Reaction with 6 M HCl: none |
| Reaction with 15 M HNO3: none | Reaction with 6 M NaOH: none |
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 |
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 |
