General: |
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Name: Uranium
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Symbol: U
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Group: Rare Earth, Actinides
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Atomic weight: 238.029
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Density @ 293 K: 18.9 g/cm3
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Atomic volume: 12.59 cm3/mol
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Group: Rare Earth, Actinides
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discovered: 1789
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States: |
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state (s, l, g): s
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melting point: 1405.2 K
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boiling point: 4203 K
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Heat of fusion: 8.520 kJ/mol
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Heat of vaporization: 477.0 kJ/mol
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Energies: |
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1st ionization energy: 584 kJ/mole
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electronegativity: 1.7
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2nd ionization energy: kJ/mole
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electron affinity: kJ/mole
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3rd ionization energy: kJ/mole
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Specific heat: 0.12 J/gK
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heat atomization: 490 kJ/mole atoms
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Oxidation & Electrons: |
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Shells: 2,8,18,32,21,9,2
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electron configuration: [Rn] 5f3 6d1 7s2
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minimum oxidation number: 0
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maximum oxidation number: 6
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min. common oxidation no.: 0
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max. common oxidation no.: 6
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Appearance & Characteristics: |
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structure: hcp:hex cls pkd distorted
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color: silvery
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uses: nuclear reactor fuel
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toxicity:
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hardness: mohs
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characteristics: Radioactive
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Reactions: |
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reaction with air: mild, =>U3O8
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reaction with 6M HCl: mild, =>H2
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reaction with 6M HCl: mild, =>H2
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reaction with 15M HNO3: passivated
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reaction with 6M NaOH: none
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Other Forms: |
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number of isotopes: 3
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hydride(s): UH3
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oxide(s): UO UO2 U2O5 U3O8 UO3
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chloride(s): UCl3 UCl4 UCl5 UCl6
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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: 156 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): 116.5 pm
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Conductivity: |
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thermal conductivity: 27.5 J/m-sec-deg
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electrical conductivity: 33.333 1/mohm-cm
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polarizability: 27.4 A^3
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Abundance: |
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source: Uranite (oxide)
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rel. abund. solar system: -2.046 log
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abundance earth's crust: 0.4 log
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cost, pure: $/100g
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cost, bulk: $/100g
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