General: |
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Name: Cesium
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Symbol: Cs
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Group: Alkali Met.
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Atomic weight: 132.9054
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Density @ 293 K: 1.873 g/cm3
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Atomic volume: 71.07 cm3/mol
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Group: Alkali Met.
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discovered: 1860
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States: |
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state (s, l, g): s
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melting point: 301.6 K
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boiling point: 978 K
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Heat of fusion: 2.092 kJ/mol
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Heat of vaporization: 67.740 kJ/mol
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Energies: |
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1st ionization energy: 375.7 kJ/mole
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electronegativity: 0.79
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2nd ionization energy: 2421.8 kJ/mole
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electron affinity: 45.506 kJ/mole
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3rd ionization energy: kJ/mole
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Specific heat: 0.24 J/gK
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heat atomization: 79 kJ/mole atoms
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Oxidation & Electrons: |
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Shells: 2,8,18,18,8,1
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electron configuration: [Xe] 6s1
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minimum oxidation number: 0
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maximum oxidation number: 1
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min. common oxidation no.: 0
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max. common oxidation no.: 1
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Appearance & Characteristics: |
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structure: bcc: body-centered cubic
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color: yellow/silvery
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uses: photocells, IR lamps
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toxicity:
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hardness: 0.2 mohs
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characteristics: softest metal
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Reactions: |
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reaction with air: vigorous, =>CsO2
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reaction with 6M HCl: vigorous, =>H2, CsCl
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reaction with 6M HCl: vigorous, =>H2, CsCl
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reaction with 15M HNO3: vigorous, =>CsNO3
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reaction with 6M NaOH: vigorous, =>H2, CsOH
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Other Forms: |
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number of isotopes: 1
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hydride(s): CsH
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oxide(s): Cs2O
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chloride(s): CsCl
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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: 265 pm
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ionic radius (1+ ion): 181 pm
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ionic radius (2+ ion): pm
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ionic radius (3+ ion): pm
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Conductivity: |
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thermal conductivity: 35.9 J/m-sec-deg
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electrical conductivity: 48.9 1/mohm-cm
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polarizability: 59.6 A^3
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Abundance: |
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source: Li extractn by-product
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rel. abund. solar system: -0.429 log
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abundance earth's crust: 0 log
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cost, pure: 1100 $/100g
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cost, bulk: $/100g
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