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nature : Periodic System V main ethnic group (group N) elements. Atomic number 33. Stable isotopes : 75. Amu 74.92160. The common arsenic. A gray, yellow and black with allotropy. These gray metal crystals, but brittle and hard. Density 5.72. The 615 ° C sublimation. The temperature of 817 ° C (about 3.6 MPa 36 atmospheric pressure). Valence ± 5 and ± 3. With water, alkali or acid oxidation reaction can not afford. Soluble nitric acid, concentrated sulfuric acid and aqua regia. The air surface oxide formation and quickly lost luster. The 200 ° C leads to oxygen namely, the fluorescence. Arsenic and the soluble arsenic compounds are highly toxic! System for Arsenic salts, carbide (ketone, lead), pharmaceuticals, preservatives, Mordant, such as pesticides. As for the high-purity semiconductor and laser technology. Natural compounds in the major states of existence, or as single-existence of quality. FeAsS arsenic in pyrite, realgar As4 S4, orpiment As2 S3 so. Arsenic trioxide can be used and the reduction of carbon in the system.
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