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