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The Elements Elements are pure substances. The atoms of each element are slrfc.orgically unique and different from those of any type of other facet. Approximately 110 elements are currently recognized. By 1980, 106 of these had been unequivocally identified and also accepted by the Internationwide Union of Pure and Applied slrfc.orgistry (IUPAC). Because that time, facets 107 and also 109 have actually been determined among the commodities of a nuclear reaction. The search for new aspects proceeds in many type of laboratories around the world; brand-new aspects may be announced at any type of time. A. Names and Symbols of the Elements Each facet has a name. Many kind of of these names are currently acquainted to you - gold, silver, copper, chlorine, platinum, carbon, oxygen, and nitrogen. The names themselves are exciting. Many kind of refer to a property of the aspect. The Latin name for gold is aurum, meaning "shining dawn." The Latin name for mercury, hydrargyrum, means "liquid silver." The exercise of naming an aspect after one of its properties continues. Cesium was uncovered in 1860 by the German slrfc.orgist Bunsen (the inventor of the Bunsen burner). Due to the fact that this aspect imcomponents a blue shade to a flame, Bunsen named it cesium from the Latin word caesius, interpretation "sky blue." Other elements are named for civilization. Curium is named for Marie Curie (1867-1934), a pioneer in the examine of radioactivity. Marie Curie, a French scientist of Polish birth, was awarded the Nobel Prize in Physics in 1903 for her research studies of radiotask. She was additionally awarded the Nobel Prize in slrfc.orgistry in 1911 for her exploration of the aspects polonium (called after Poland) and radium (Latin, radius, "ray"). Some facets are named for areas. The little town of Ytterby in Sweden has 4 facets called for it: terbium, yttrium, erbium, and also ytterbium. Californium is another instance of an aspect named for the location wbelow it was first observed. This aspect does not happen in nature. It was initially produced in 1950 in the Radiation Laboratory at the University of The golden state, Berkeley, by a team of scientists headed by Glenn Seaborg. Seaborg was also the first to identify curium at the metallurgical laboratory at the University of Chicback (currently Argonne National Laboratory) in 1944. Seaborg himself was named a Nobel laureate in 1951 in honor of his pioneering work in the preparation of other unwell-known elements. Each element has a symbol,one or 2 letters that represent the aspect a lot as your initials reexisting you. The symbol of an facet represents one atom of that facet. For 14 of the elements, the symbol consists of one letter. With the feasible exceptions of yttrium (Y) and also vanadium (V), you are more than likely acquainted with the names of all elements having actually one-letter signs. These aspects are provided in Table 3.1. For 12 of these aspects, the symbol is the initially letter of the name. Potassium was discovered in 1807 and called for potash, the substance from which potassium was first isolated. Potassium"s symbol, K, comes from kalium, the Latin word for potash. Tungsten, discovered in 1783, has actually the symbol W, for wolframite, the mineral from which tungsten was initially isolated. TABLE 3.1 Elements through one-letter symbolsSymbolElementBboron CcarbonFfluorineHhydrogenIiodineNnitrogenOoxygenSymbolElement PphosphorusKpotassiumSsulfurWtungstenUuraniumVvanadium Yyttrium

Many various other aspects have two-letter signs. In these two-letter symbols, the initially letter is constantly capitalized and also the second is always lowercased. Eleven facets have names (and symbols) beginning through the letter C. One of these, carbon, has a one-letter symbol, C. The various other ten have two-letter icons (check out Table 3.2). TABLE 3.2 Elements whose name starts with the letter CSymbolElementCdcadmium CacalciumCfcaliforniumCcarbonCeceriumCscesiumSymbolElement ClchlorineCrchromiumCocobaltCucopperCmcurium

B. Lists of the Elements While you research slrfc.orgistry, you will certainly frequently need a list of the elements. To see a list of the aspects click here. The list contains the symbol, the atomic number, and the atomic weight of the aspect. The significance of atomic numbers and weights will be disputed in Chapter 4. For currently it is enough to recognize that each aspect has actually a number in between 1 and also 110 dubbed its atomic number. This number is as distinct to the facet as its name or symbol. The second list, referred to as the routine table, ararrays the aspects in order of raising atomic number in rows of differing size. The definition of the size of the row and the relation among aspects in the very same row or column will certainly be disputed in Chapter 5. The periodic table appears by clicking on the inside of the front cover of this message. Throughout the text we will describe the regular table, bereason it includes an exceptional amount of information. For currently you require only be conscious that facets in the same column have similar properties and that the heavy stair-action line that crosses the table diagonally from boron (B) to astatine (At) separates the metallic aspects from the nonmetallic aspects. The periodic table is also presented in Figure 3.3. The screened areas note the aspects you will certainly enrespond to many frequently in this text.

1. Metals and also nonsteels Metals show up below and to the left of the heavy diagonal line in the routine table. The characteristic properties of a metal are:It is shiny and lustrous. It conducts warmth and electricity. It is ductile and malleable; that is, it deserve to be drawn into a wire and deserve to be hammered into a thin sheet. It is a solid at 20°C. Mercury is the only exception to this rule; it is a liquid at room temperature. Two various other metals, gallium and also cesium, have actually melting points close to room temperature (19.8°C and 28.4°C). Nonsteels vary more in their properties than execute metals; some may even have actually one or more of the metallic properties noted. Some nonsteels are gaseous; chlorine and nitrogen are gaseous nonsteels.

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At 20°C one nonsteel, bromine, is a liquid, and others are solids - for example, carbon, sulfur, and phosphorus.