Arsenic By John Lee

General Information and Atomic Structure

Arsenic- As
Atomic number- 33
Atomic mass- 74.9216 amu
Protons- 33
Electrons- 33
Most common istope- As-75
Number of neutrons- 42


Arsenic was discovered by Albertus Magnus in 1250
The origin of arsenic comes from the Greek word arsenikon meaning yellow orpiment.
Arsenic is commonly used in weed killer, and rat killer. Arsenides, certain compounds formed by arsenic, are frequently used in paint and ceramics.

Physical Properties

State at room temperature- Solid
Melting point- 817.0 C
Boiling point- 613.0 C
Density- 5.72 g/cm^3
Abundance in earths crust- 0.00021%

Chemical Properties

Elements that will react with Arsenic; Hydrogen- Hydrogen and Arsenic form a gas, Arsine. Arsine is a very toxic gas that is denser than air.
Oxygen- Arsenic, when in a solid state, is oxidized when exposed to oxygen. The surface becomes black. When heated in oxygen gas, arsenic combines with oxygen to form tetraarsenic decaoxide, or arsenious oxide.

Compounds that contain Arsenic-
Diarsenic tetrahydride
Arsenic trifluoride
Arsenic pentafluoride
Arsenic trichloride
Arsenic pentachloride
Arsenic triiodide
Diarsenic tetraiodide
Diarsenic trioxide
Diarsenic pentoxide
Diarsenic trisulphide
Diarsenic pentasulphide
Diarsenic triselenide
Diarsenic pentaselenide
Diarsenic trielluride

The main use of arsenic is for the strengthening of alloys and lead, especially in car batteries. The lead components in car batteries are strengthened by the presence of a few percent arsenic. Without arsenic's strengthening powers, car batteries would not be the same. Arsenic's uses have seriously changed over the past years. In the past, arsenic was notorious for its poisoning abilities and its uses in WW2. However, Arsenic is used in today's society to help and assist in the production of society.

Bohr model of Arsenic

Lewis dot structure