Arsenic when was it discovered

A percentile rank for the political stability of the country with the largest reserves, derived from World Bank governance indicators. Specific heat capacity is the amount of energy needed to change the temperature of a kilogram of a substance by 1 K. A measure of the stiffness of a substance. It provides a measure of how difficult it is to extend a material, with a value given by the ratio of tensile strength to tensile strain. A measure of how difficult it is to deform a material.

It is given by the ratio of the shear stress to the shear strain. A measure of how difficult it is to compress a substance. It is given by the ratio of the pressure on a body to the fractional decrease in volume. A measure of the propensity of a substance to evaporate.

It is defined as the equilibrium pressure exerted by the gas produced above a substance in a closed system. This Site has been carefully prepared for your visit, and we ask you to honour and agree to the following terms and conditions when using this Site.

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Nor shall the RSC be in any event liable for any damage to your computer equipment or software which may occur on account of your access to or use of the Site, or your downloading of materials, data, text, software, or images from the Site, whether caused by a virus, bug or otherwise. Jump to main content. Periodic Table. Glossary Allotropes Some elements exist in several different structural forms, called allotropes. Discovery date approx Discovered by Albertus Magnus Origin of the name The name is thought to come from 'arsenikon', the Greek name for the yellow pigment orpiment.

Glossary Group A vertical column in the periodic table. Fact box. Glossary Image explanation Murray Robertson is the artist behind the images which make up Visual Elements. Appearance The description of the element in its natural form.

Biological role The role of the element in humans, animals and plants. Natural abundance Where the element is most commonly found in nature, and how it is sourced commercially. Uses and properties. Image explanation. Prawns contain quite high levels of arsenic, in an organoarsenic form which is not harmful to health. Arsenic is a semi-metal. In its metallic form it is bright, silver-grey and brittle.

Arsenic is a well-known poison. Arsenic compounds are sometimes used as rat poisons and insecticides but their use is strictly controlled. Surprisingly, arsenic can also have medicinal applications. Today, organoarsenic compounds are added to poultry feed to prevent disease and improve weight gain.

Arsenic is used as a doping agent in semiconductors gallium arsenide for solid-state devices. It is also used in bronzing, pyrotechnics and for hardening shot. Biological role. Some scientists think that arsenic may be an essential element in our diet in very, very low doses. In small doses it is toxic and a suspected carcinogen. Once inside the body it bonds to atoms in the hair, so analysing hair samples can show whether someone has been exposed to arsenic.

Some foods, such as prawns, contain a surprising amount of arsenic in a less harmful, organic form. Natural abundance. A small amount of arsenic is found in its native state. It is mainly found in minerals. The most common arsenic-containing mineral is arsenopyrite. Others include realgar, orpiment and enargite.

Most arsenic is produced as a by-product of copper and lead refining. It can be obtained from arsenopyrite by heating, causing the arsenic to sublime and leave behind iron II sulfide. Help text not available for this section currently. Elements and Periodic Table History.

Arsenic was known to the ancient Egyptian, and is mentioned in one papyrus as a ways of gilding metals. He compiled his great work on the natural world in the s, during the Ming dynasty. He noted the toxicity associated with arsenic compounds and mentioned their use as pesticides in rice fields. A more dangerous form of arsenic, called white arsenic, has also been long known. This was the trioxide, As 2 O 3 , and was a by-product of copper refining.

When this was mixed with olive oil and heated it yielded arsenic metal itself. The discovery of the element arsenic is attributed to Albertus Magnus in the s. Atomic data. Bond enthalpies. Glossary Common oxidation states The oxidation state of an atom is a measure of the degree of oxidation of an atom. Oxidation states and isotopes. Glossary Data for this section been provided by the British Geological Survey. Relative supply risk An integrated supply risk index from 1 very low risk to 10 very high risk.

Recycling rate The percentage of a commodity which is recycled. Substitutability The availability of suitable substitutes for a given commodity. Reserve distribution The percentage of the world reserves located in the country with the largest reserves. Political stability of top producer A percentile rank for the political stability of the top producing country, derived from World Bank governance indicators.

Political stability of top reserve holder A percentile rank for the political stability of the country with the largest reserves, derived from World Bank governance indicators. Supply risk. Relative supply risk 7. Young's modulus A measure of the stiffness of a substance. Shear modulus A measure of how difficult it is to deform a material. Bulk modulus A measure of how difficult it is to compress a substance.

Vapour pressure A measure of the propensity of a substance to evaporate. Pressure and temperature data — advanced. Arsenic is pronounced as AR-s'n-ik. Although arsenic compounds were mined by the early Chinese, Greek and Egyptian civilizations, it is believed that arsenic itself was first identified by Albertus Magnus, a German alchemist, in Today, most commercial arsenic is obtained by heating arsenopyrite.

Arsenic and its compounds are poisonous. They have been used to make rat poison and some insecticides. Small amounts of arsenic are added to germanium to make transistors. Gallium arsenide GaAs can produce laser light directly from electricity. Sometimes the motives were political, sometimes personal. The use of arsenic to knock off inconvenient people was finally slowed down by advances in chemistry and forensic science. Once a test was developed to measure arsenic in tissue or body fluids in , it was possible to prove the cause of death, making it much harder to get away with the crime.

It is hard to know for sure how much of the accounts of poisonings are true and how much was invention, but there are many infamous incidents of arsenic poisoning. Accidental poisoning by arsenic has also occurred.

For a long time, arsenic was used to make pigments dyes or colours that were used in paint, fabric and wallpaper. Paris Green is an example of a pigment that contains arsenic.

A chemist by the name of Gosio found that all the children who died had been living in rooms with wallpaper containing Paris Green, and there was mildew on the walls.

Mold growing on the wallpaper released the arsenic in the pigment and formed arsine gas.