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Arsenic

Metalloidsolid
Symbol: As
Atomic number: 33
Atomic mass: 74.92159
Group: Non-Metal
CAS-number: 7440-38-2

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Physical data
Isotopes
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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 5
Orbitals: [Ar] 3d10 4s2 4p3
Electronegativity: 2.0, 2.2
1. Ionization potential: 9.8152 eV
2. Ionization potential: 18.633 eV
3. Ionization potential: 28.351 eV
Oxidation states: 5, 3, -3
Electrical conductivity: 0.0345 10^6
Melting point: 817 °C @ 28 atmos.
Boiling point: 613 °C Sublimes at
Specific heat: 0.33 J/gK
Heat of fusion: -- kJ/mol
Heat of vaporization: 34.760 kJ/mol
Thermal conductivity: 0.500 W/cmK
Atomic radius: 1.33 Å
Ionic radius: 0.58 Å (+3)
Covalent radius: 1.20 Å
Atomic volume: 13.1 cm³/mol
Density (293 K): 5.72 g/cm³
Crystal structure: rhombohedral
rhombohedral

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
71As 0 71 5/2 2.72d EC, β+ View
72As 0 72 2 26.0h β+, EC View
73As 0 73 3/2 80.3d EC View
74As 0 73.924 2 17.78d EC, β+, β- View
75As 100 74.9216 3/2 -- --
76As 0 75.922 2 26.3h β- View
77As 0 76.921 3/2 38.8h β- View

Other info

Name origin:Greek: arsenikon; Latin: arsenicum, (both names for yellow pigment)
Description:Steel-gray, brittle semi-metal.
Discovered by:Known to the ancients
Year:--
Place:Unknown
Sources:Found in mispickel (arsenopyrite).
Use(s):Many of its compounds are deadly poison and used as weed killer and rat poison. Conducts electricity and used in semiconductors. Some compounds, called arsenides, are used in the manufacture of paints, wallpapers, and ceramics.