Arsenic occurs throughout the universe, mostly in the form of metallic arsenides. Most forms are toxic. According to the Fourth Annual Report on Carcinogens (NTP 85-002, 1985), arsenic and certain arsenic compounds have been listed as known carcinogens. Arsenic is a nonessential trace element that is widely distributed in nature. Arsenic was used in medicinal agents in the 19th and early 20th centuries, but has been replaced by safer and more effective agents and has not been in use for over 50 years. Nevertheless, arsenic is found widely in nature and accidental or intentional acute or chronic exposures to moderate or high levels of arsenic can cause liver injury, sometimes presenting long after the exposure.
Formula – As
Molar mass – 74.922 g/mol
CAS Number – 7440-38-2
Density – 5.727 g/mL at 25 °C (77 °F)
Purity/Grade – 99.999% trace metals basis
Appearance – Powder
Melting point/freezing point – Melting point/range: 817°C (1,503°F) – lit.
Flash point – Not applicable
Initial boiling point and boiling range – 613°C (1,135°F) – lit.