Arsenic
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33As
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Panagway
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metallic grey
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Kinatibuk-ang mga kinaiya
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Ngalan, simbolo, kaiphan
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arsenic, As, 33
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Paglitok
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[[Help:Pronunciation respelling key|Plantilya:Smallcaps all-sə-nik]], also [[Help:Pronunciation respelling key|ar-Plantilya:Smallcaps all-ik]] when attributive
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Kategoriyang elemento
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metalloid
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Group, period, block
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15, 4, p
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Gibug-aton sa atomo
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74.92160(2)
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Kontorno sa elektron
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[Ar] 4s2 3d10 4p3 2, 8, 18, 5
Electron shells of arsenic (2, 8, 18, 5)
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History
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Pagkadiskobre
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Early Bronze Age (2500 BC)
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First isolation
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Albertus Magnus (1250)
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Physical properties
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Phase
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magahi
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Density (near r.t.)
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5.727 g·cm−3 |
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Liquid density at m.p.
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5.22 g·cm−3 |
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Sublimation point
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887 K, 615 °C, 1137 °F
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Triple point
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1090 K (817°C), 3628[1] kPa
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Critical point
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1673 K, ? MPa
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Heat of fusion
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(grey) 24.44 kJ·mol−1
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Heat of vaporization
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? 34.76 kJ·mol−1 |
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Molar heat capacity
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24.64 J·mol−1·K−1 |
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Vapor pressure
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P (Pa)
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1
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10
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100
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1 k
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10 k
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100 k
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553
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596
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646
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706
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781
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874
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Atomic properties
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Oxidation states
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5, 3, 2, 1,[2] -3 (mildly acidic oxide)
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Electronegativity
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2.18 (Pauling scale)
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Ionization energies (more)
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1st: 947.0 kJ·mol−1 |
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2nd: 1798 kJ·mol−1 |
3rd: 2735 kJ·mol−1 |
Atomic radius
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119 pm
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Covalent radius
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119±4 pm
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Van der Waals radius
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185 pm
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Miscellanea
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Crystal structure
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simple trigonal[3]
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Magnetic ordering
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diamagnetic[4] |
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Electrical resistivity
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(20 °C) 333 nΩ·m
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Thermal conductivity
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50.2 W·m−1·K−1 |
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Young's modulus
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8 GPa
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Bulk modulus
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22 GPa
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Mohs hardness
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3.5
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Brinell hardness
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1440 MPa
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CAS registry number
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7440-38-2
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Most stable isotopes
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Main article: Isotopes of arsenic
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· r
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