Information

General Information

Atomic symbol As

Atomic number 33

Atomic mass 74.92

Melting point 817.0^o C

Boiling point 613.0^o C

Number of protons/electrons 33

Number of neutrons 42

Classification Metalloid

Crystal Structure Rhombohedral

Density 5.72g/cm³

Colour Grey

Origin Mispickel, arsenopyrite, (FeSAs) is the most common mineral from
which, on heating, the arsenic sublimes leaving ferrous sulfide.

Common compounds AsH₃; As₂O₅; As₄O₆; AsO; AsI₅; AsI₃; [AsI₂]₂; AsBr₃; AsCl₅;
AsCl₃; AsF₅; AsF₃.

Isotopes (Natural / radioactive) ⁷⁵As / ⁶⁹As; ⁷⁰As; ⁷¹As; ⁷²As; ⁷³As; ⁷⁴As; ⁷⁶As; ⁷⁷As; ⁷⁸As; ⁷⁹As.

Origin of name Latin: arsenicum, Greek: 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

Properties Elemental arsenic occurs in two solid modifications: yellow, and gray
or metallic, with specific gravities of 1.97, and 5.73, respectively.
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. Arsenic and its compounds
are poisonous.

Uses Arsenic is used in bronzing, pyrotechny, and for hardening and
improving the sphericity of shot. 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.

Atomic symbol	As
Atomic number	33
Atomic mass	74.92
Melting point	817.0^o C
Boiling point	613.0^o C
Number of protons/electrons	33
Number of neutrons	42
Classification	Metalloid
Crystal Structure	Rhombohedral
Density	5.72g/cm³
Colour	Grey
Origin	Mispickel, arsenopyrite, (FeSAs) is the most common mineral from which, on heating, the arsenic sublimes leaving ferrous sulfide.
Common compounds	AsH₃; As₂O₅; As₄O₆; AsO; AsI₅; AsI₃; [AsI₂]₂; AsBr₃; AsCl₅; AsCl₃; AsF₅; AsF₃.
Isotopes (Natural / radioactive)	⁷⁵As / ⁶⁹As; ⁷⁰As; ⁷¹As; ⁷²As; ⁷³As; ⁷⁴As; ⁷⁶As; ⁷⁷As; ⁷⁸As; ⁷⁹As.
Origin of name	Latin: arsenicum, Greek: 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
Properties	Elemental arsenic occurs in two solid modifications: yellow, and gray or metallic, with specific gravities of 1.97, and 5.73, respectively. 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. Arsenic and its compounds are poisonous.
Uses	Arsenic is used in bronzing, pyrotechny, and for hardening and improving the sphericity of shot. 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.