General: |
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Name: Arsenic
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Symbol: As
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Group: Non-Metal, Nitrogen group
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Atomic weight: 74.9216
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Density @ 293 K: 5.72 g/cm3
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Atomic volume: 13.1 cm3/mol
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Group: Non-Metal, Nitrogen group
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discovered: 1600
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States: |
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state (s, l, g): s
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melting point: 886 K
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boiling point: K
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Heat of fusion: ?
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Heat of vaporization: 34.760 kJ/mol
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Energies: |
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1st ionization energy: 946.5 kJ/mole
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electronegativity: 2.18
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2nd ionization energy: 1797.8 kJ/mole
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electron affinity: 78 kJ/mole
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3rd ionization energy: 2735.4 kJ/mole
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Specific heat: 0.33 J/gK
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heat atomization: 302 kJ/mole atoms
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Oxidation & Electrons: |
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Shells: 2,8,18,5
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electron configuration: [Ar] 3d10 4s2 4p3
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minimum oxidation number: -3
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maximum oxidation number: 5
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min. common oxidation no.: -3
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max. common oxidation no.: 5
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Appearance & Characteristics: |
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structure: rhombohedral
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color: gray
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uses: photocells (GaAs), poisons
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toxicity:
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hardness: 3.5 mohs
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characteristics: semimetal,brittle,3 forms
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Reactions: |
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reaction with air: mild, w/ht =>As4O6
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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: mild, w/ht =>H3AsO4, NOx
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reaction with 6M NaOH: none
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Other Forms: |
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number of isotopes: 1
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hydride(s): AsH3
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oxide(s): As2O3
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chloride(s): AsCl3 AsCl5
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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: 120 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): 72 pm
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Conductivity: |
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thermal conductivity: 50.2 J/m-sec-deg
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electrical conductivity: 30.03 1/mohm-cm
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polarizability: 4.3 A^3
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Abundance: |
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source: Arsenopyrite, enargite (misc)
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rel. abund. solar system: 0.817 log
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abundance earth's crust: 0.3 log
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cost, pure: 320 $/100g
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cost, bulk: $/100g
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