Element Arsenic

Arsenic ElementIt is a chemical element with the symbol As and atomic number 33.
Element Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Arsenic is a metalloid. It has various allotropes, but only the gray form, which has a metallic appearance, is important to industry.
The primary use of arsenic is in alloys of lead (for example, in car batteries and ammunition). Arsenic is a common n-type dopant in semiconductor electronic devices, and the optoelectronic compound gallium arsenide is the second most commonly used semiconductor after doped silicon

Names and Identifiers

Chemical Formula:As
CAS:7440-38-2
Molecular Weight:77.94540 g/mol
EC Number :231-148-6
MDL Number:MFCD00085309
Color:metallic gray/ gray
Other Names:Arsen, Arsenico, Arsenik
PubChem CID:5359596
IUPAC Name:Arsenic
Inchl:InChI=1S/As
InChI Key:RQNWIZPPADIBDY-UHFFFAOYSA-N
Canonical SMILES:[As]
ICSC Number:0013

Physical & Chemical Properties

Phase:Solid
Density:5.727 g/cm³
Triple point:1090 K, ​3628 kPa
Molecular Formula: As
Flash Point:n/a
Exact Mass:77.94510
Symbol:Globally Harmonized System of ClassificationGlobally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H301 + H331-H410
Precautionary Statements:P261-P273-P301 + P310-P311-P501
Hazard Codes:T:Toxic
Risk Phrases:R23/25;R50/53
Safety Phrases:S20/21-S28-S45-S60-S61-S26-S53
RIDADR:UN 1558 6.1/PG 2
WGK Germany:3
RTECS:CG0525000
Packaging Group:II
Hazard Class:6.1

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
75As74.9215942 (17)1003/21.43947

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
68As67.93682.53 mEC to 68Ge3
69As68.9322815.2 mEC to 69Ge5/21.2
70As69.9309352.6 mEC to 70Ge42.1061
71As70.9271142.72 dEC to 71Ge5/21.6735
72As71.92675326.0 hEC to 72Ge2-2.1566
73As72.92382580.3 dEC to 73Ge3/2
74As73.92382917.78 dβ to 74Se; EC to 74Ge2-1.597
76As75.92239426.3 hβ to 76Se2-0.906
77As76.92064838.8 hβ to 77Se3/2
78As77.921831.512 hβ to 78Se2
79As78.920959.0 mβ to 79Se3/2

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