free-content
HomeFree Content Periodic Table Arsenic  

Arsenic


<< back to Periodic Table
My Saved Article
Atomic Number:33Atomic Symbol:As
Atomic Weight:74.9216Electron Configuration:2-8-18-5
Shells:2,8,18,5Filling Orbital:4p3
Melting Point:817 @ 28 atm.oCBoiling Point:sublimes @ 613oC
Uses:LEDs, deadly poison, semiconductors

History

(L. arsenicum, Gr. arsenikon, yellow orpiment, identified with arenikos, male, from the belief that metals were different sexes; Arabic, Az-zernikh, the orpiment from Persian zerni-zar, gold)

Sources

Elemental arsenic occurs in two solid modifications: yellow, and gray or metallic, with specific gravities of 1.97, and 5.73, respectively.
It is believed that Albertus Magnus obtained the element in 1250 A.D.
In 1649 Schroeder published two methods of preparing the element.
Mispickel, arsenopyrite, (FeSAs) is the most common mineral from which, on heating, the arsenic sublimes leaving ferrous sulfide.

Properties

The element is a steel gray, very brittle, crystalline, semimetallic solid; it tarnishes in air, and when heated is rapidly oxidized to arsenous oxide with the odor of garlic.

Handling

Arsenic and its compounds are poisonous.
Arsenic is used in bronzing, pyrotechny, and for hardening and improving the sphericity of shot.

Compounds

The most important compounds are white arsenic, the sulfide, Paris green, calcium arsenate, and lead arsenate; the last three have been used as agricultural insecticides and poisons.
Marsh's test makes use of the formation and ready decomposition of arsine.
Arsenic is finding increasing uses as a doping agent in solid-state devices such as transistors. Gallium arsenide is used as a laser material to convert electricity directly into coherent light.

1  Top
 

ABOUT SSL CERTIFICATES