Krypton (element)

Having discovered the noble gas argon, extracted from air, William Ramsay and Morris William Travers of University College, London, were convinced this must be one of .

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The chemical element krypton is classed as a noble gas and a nonmetal. It was discovered in by William Ramsay and his assistant Morris Travers.

Boiling point The temperature at which the liquid—gas phase change occurs. Sublimation The transition of a substance directly from the solid to the gas phase without passing through a liquid phase. Relative atomic mass The mass of an atom relative to that of carbon This is approximately the sum of the number of protons and neutrons in the nucleus.

Where more than one isotope exists, the value given is the abundance weighted average. Isotopes Atoms of the same element with different numbers of neutrons. CAS number The Chemical Abstracts Service registry number is a unique identifier of a particular chemical, designed to prevent confusion arising from different languages and naming systems. Murray Robertson is the artist behind the images which make up Visual Elements. This is where the artist explains his interpretation of the element and the science behind the picture.

Where the element is most commonly found in nature, and how it is sourced commercially. Atomic radius, non-bonded Half of the distance between two unbonded atoms of the same element when the electrostatic forces are balanced.

These values were determined using several different methods. Covalent radius Half of the distance between two atoms within a single covalent bond.

Values are given for typical oxidation number and coordination. Electron affinity The energy released when an electron is added to the neutral atom and a negative ion is formed. Electronegativity Pauling scale The tendency of an atom to attract electrons towards itself, expressed on a relative scale.

First ionisation energy The 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 a 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 low 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 percentage of an element produced in the top producing country. 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 stability of the top producing country, derived from World Bank governance indicators.

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. Copyright of and ownership in the Images reside with Murray Robertson. The RSC has been granted the sole and exclusive right and licence to produce, publish and further license the Images.

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Jump to main content. Glossary Allotropes Some elements exist in several different structural forms, called allotropes. Glossary Group A vertical column in the periodic table. 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.

There are many different isotopes of krypton. This symbol represents the isotope krypton Krypton is a gas with no colour or smell. It does not react with anything except fluorine gas.

Krypton is used commercially as a filling gas for energy-saving fluorescent lights. It is also used in some flash lamps used for high-speed photography. Unlike the lighter gases in its group, it is reactive enough to form some chemical compounds. For example, krypton will react with fluorine to form krypton fluoride.

Krypton fluoride is used in some lasers. Radioactive krypton was used during the Cold War to estimate Soviet nuclear production. The gas is a product of all nuclear reactors, so the Russian share was found by subtracting the amount that came from Western reactors from the total in the air. From to the isotope krypton was used to define the standard measure of length. One metre was defined as exactly 1,, It makes up just 1 part per million by volume.

It is extracted by distillation of air that has been cooled until it is a liquid. Help text not available for this section currently. Elements and Periodic Table History. Having discovered the noble gas argon, extracted from air, William Ramsay and Morris William Travers of University College, London, were convinced this must be one of a new group of elements of the periodic table. They decided others were likely to be hidden in the argon and by a process of liquefaction and evaporation they hoped it might leave behind a heavier component, and it did.

It yielded krypton in the afternoon of 30 th May , and they were able to isolate about 25 cm 3 of the new gas. This they immediately tested in a spectrometer, and saw from its atomic spectrum that it was a new element. 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. Het is een kleurloos edelgas. In is krypton ontdekt door William Ramsay en Morris Travers. Een week later ontdekte het duo op dezelfde manier ook neon.

De naam krypton is afkomstig van het Griekse kryptos , wat verborgen betekent. Krypton is duur 30 tot 65 dollar per liter en in de meeste gevallen te vervangen door goedkopere edelgassen. Daarom wordt het slechts op zeer beperkte schaal industrieel toegepast. Enkele gebieden waar krypton wel wordt gebruikt zijn:. Krypton is een edelgas dat bekendstaat om de scherpe groene en oranjerode lijnen in het spectrum.

In de aardse atmosfeer komt krypton voor in een concentratie van ongeveer 1 ppm. Krypton wordt uit de lucht gewonnen met behulp van fractionele destillatie. Hoewel krypton een edelgas is, lijkt het erop dat er toch verbindingen mogelijk zijn. In de natuur komen zes stabiele isotopen van krypton voor.

Daarnaast zijn er ongeveer 18 instabiele isotopen bekend waarvan alleen 78 Kr in de natuur voorkomt. Krypton is niet brandbaar en niet giftig, maar in hoge concentraties kan het verstikkend werken door verdringing van zuurstof. Uit Wikipedia, de vrije encyclopedie. The Linde Group 27 januari eerste uitgave , 18 juni herzien.