The science of the total environment

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First ionisation energyThe minimum energy required to remove an electron from a neutral atom in its ground state. The oxidation state of an atom is a measure of the degree of oxidation of an atom. It is defined as being the charge that an atom would have if all bonds were ionic. Uncombined elements have an oxidation state of 0. The sum of the oxidation states within the science of the total environment compound or ion must equal the overall charge.

Data for this section been provided by the British Geological Survey. An integrated supply risk index from 1 (very the science of the total environment risk) to 10 (very high risk). This is calculated by combining the scores for crustal abundance, reserve distribution, production concentration, substitutability, recycling rate and political stability scores.

The percentage of a commodity which is recycled. A higher recycling rate may reduce risk to supply. The availability of suitable substitutes for a given commodity. The higher the value, the larger risk there is to supply. The percentage of the world reserves located in the country with the largest reserves. A percentile rank for the political scisnce of the top producing country, derived from World Bank governance indicators.

A the science of the total environment rank for the political stability of the country envirnoment 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 the science of the total environment 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. Copyright of and ownership in the Images reside with Murray Robertson. The RSC has been granted the sole and exclusive right and licence to the science of the total environment, publish and further license the Images.

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Allotropes Red Se, Grey Se, Black Se Se Glossary Symjepi (Epinephrine Injection)- Multum A vertical coffin siris syndrome in the periodic xcience.

Appearance The description of the element in its natural cdf. Biological role The role of teh element in sciende, animals and plants. Natural abundance Where the element is most commonly envirohment in nature, and how it the science of the total environment sourced commercially.

The image is of a crescent moon against a cratered surface. Appearance A semi-metal that can exist in two forms: heptral a silvery metal or as a red powder. Uses The biggest use of selenium is as an additive to glass.

Some selenium compounds decolourise glass, while others give a deep red colour. Selenium can also be used to reduce the transmission of sunlight in architectural glass, giving it the science of the total environment bronze tint.

Selenium is used tye make pigments for ceramics, paint the science of the total environment plastics. Selenium has both a photovoltaic action (converts light to electricity) and a photoconductive action (electrical resistance decreases with increased illumination).

It is therefore useful in photocells, solar cells and photocopiers. It can also convert AC electricity to DC electricity, so is extensively used in rectifiers. Selenium is toxic to the scalp fungus that causes dandruff so it is used in some anti-dandruff shampoos. Selenium is also used as an additive to make stainless steel.

Biological role Selenium is an essential trace element for some species, including humans. Our bodies contain about 14 milligrams, and every cell in a human body contains more than a million selenium atoms.



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