Arsenic - ASCII Periodic Table of the Elements

ASCII PERIODIC TABLE OF THE ELEMENTS

  As

Relative atomic mass: 74.92160 ± 0.00002

English: Arsenic
French: Arsenic
Croatian: Arsen
German: Arsen
Italian: Arsenico
Spanish: Arsénico

Atomic number: 33
Group numbers: 15
Period: 4
Standard state (20 °C): solid

Discovery: 1250 Albertus Magnus (DE)

Arsenic was discovered by Albertus Magnus (DE) in 1250. The origin of the name comes from the Greek word 'arsenikon' meaning 'yellow orpiment'. It is a steel-grey, brittle semi-metal that resists water, acids and alkalis. It tarnishes in air, burns in oxygen and is highly toxic by inhalation or ingestion. Arsenic is found in mispickel (arsenopyrite). Many of its compounds are deadly poison and used as weed killer and rat poison. Some compounds, called arsenides, are used in the manufacture of paints, wallpapers and ceramics. It is also used in semiconductors

Electronic configuration: [Ar] 3d¹⁰ 4s² 4p³
Formal oxidation number: -3 +3 +5
Atomic radius: 124.5 pm

Electronegativities: 2.18
Thermal conductivity: 50 W/(m K)
Electrical resistivity (20 °C): 33.3 μΩcm

Melting point: 817 °C
Boiling point: 614 °C

Heat of fusion: 27.7 kJ/mol
Heat of vaporization: 31.9 kJ/mol
Heat of atomization: 301.42 kJ/mol