1. During the Bronze Age, arsenic was often included in bronze, which made the alloy harder . Albertus Magnus (Albert the Great, 1193–1280) is believed to have been the first European to isolate the element in 1250 by heating soap together with arsenic trisulfide. In 1649, Johann Schr?der published two ways of preparing arsenic.
2. In the Victorian era, "arsenic"  was mixed with vinegar and chalk and eaten by women to improve the complexion of their faces, making their skin paler to show they did not work in the fields.
3. The accidental use of arsenic in the adulteration of foodstuffs led to the Bradford sweet poisoning in 1858, which resulted in approximately 20 deaths and 200 people taken ill with arsenic poisoning.

IARC Cancer Review: Group 1 IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 7 (1987),p. 100.(; Human Sufficient Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 23 (1980),p. 39 ; Human Inadequate Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 2 (1973),p. 48 . Reported in EPA TSCA Inventory. Arsenic and its compounds are on the Community Right-To-Know List.

OSHA PEL: TWA 0.01 mg(As)/m³; Cancer Hazard
ACGIH TLV: TWA 0.01 mg/m³; Confirmed Human Carcinogen; BEI: 35 μ (As)/L inorganic arsenic and methylated metabolites in urine
DFG MAK: DFG TRK: 0.2 mg/m³ calculated as arsenic in that portion of dust that can possibly be inhaled
NIOSH REL: CL 2 μg(As)/m³
DOT Classification:  6.1; Label: Poison

For occupational chemical analysis use OSHA: #ID-105 or NIOSH: Arsenic (Hydride AAS), 7900.

The Arsenic with CAS registry number of 7440-38-2 is also known as Arsenicum album. The IUPAC name and product name are the same. It belongs to product categories of Industrial/Fine Chemicals; Inorganics; Arsenic; Metal and Ceramic Science; Metals; A; AAS; AAS CRMsAlphabetic; AASSpectroscopy; Allergens; Application CRMs; AR to AZMethod Specific; Extractable Heavy metalsCosmetics; Oeko-Tex Standard 100; Spectroscopy. Its EINECS registry number is 231-148-6. In addition, the formula is As and the molecular weight is 74.92. This chemical is a grey powder or chunks and should be satored in cool, ventilated ang dry place without wet. What's more, it is mainly used for manufacturing carbide, glass, pharmaceutical, paint and pesticide.

Physical properties about Arsenic are: (1)Exact Mass: 74.921596; (2)MonoIsotopic Mass: 74.921596; (3)Heavy Atom Count: 1; (4)Covalently-Bonded Unit Count: 1.

Preparation of Arsenic: it is prepared by reaction of diarsenic trioxide with carbon. The reaction equipment has three electric devices, which are gasification section, reaction section and precipitation section. As carbon is placed in reaction section, diarsenic trioxide is placed in gasification section. Purified nitrogen is passed by speed of 400~500 ml/min. While gasification section is maintained at 400 °C and reaction section is 650 °C, precipitation section is maintained at 350~400 °C for 1 hour. At last, product is obtained by distillation.

When you are using this chemical, please be cautious about it. As a chemical, it is irritating skin. It is toxic by inhalation and if swallowed. It even may cause cancer. Besides, it is very toxic to aquatic organisms that may cause long-term adverse effects in the aquatic environment. During using it, obtain special instructions before use in order to avoid release to the environment and do not eat, drink or smoke. This material and its container must be disposed of as hazardous waste. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. If accident happens or you feel unwell seek medical advice immediately.
 
You can still convert the following datas into molecular structure:
1. SMILES: [AsH3]
2. InChI: InChI=1/As
3. InChIKey: RQNWIZPPADIBDY-UHFFFAOYAR
4. Std. InChI: InChI=1S/As
5. Std. InChIKey: RQNWIZPPADIBDY-UHFFFAOYSA-N

The toxicity data is as follows: