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Dividing Line Between Metals And Nonmetals
The dividing line between metals and nonmetals can be found, in varying configurations, on some representations of the periodic table of the elements (see mini-example, right). Elements to the lower left of the line generally display increasing metallic behaviour; elements to the upper right display increasing nonmetallic behaviour. When presented as a regular stair-step, elements with the highest critical temperature for their groups (Li, Be, Al, Ge, Sb, Po) lie just below the line. The location and therefore usefulness of the line is debated. It cuts through the metalloids, elements that share properties between metals and nonmetals, in an arbitrary manner, since the transition between metallic and non-metallic properties among these elements is gradual. Names This line has been called the ''amphoteric line,'' Levy 2001, p. 158 the ''metal-nonmetal line,'' the ''metalloid line,'' the ''semimetal line,'' or the ''staircase.'' While it has also been called the ''Zintl bord ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alkali Metal
The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K),The symbols Na and K for sodium and potassium are derived from their Latin names, ''natrium'' and ''kalium''; these are still the origins of the names for the elements in some languages, such as German and Russian. rubidium (Rb), caesium (Cs), and francium (Fr). Together with hydrogen they constitute Group (periodic table)#Group names, group 1, which lies in the s-block of the periodic table. All alkali metals have their outermost electron in an s-orbital: this shared electron configuration results in their having very similar characteristic properties. Indeed, the alkali metals provide the best example of periodic trends, group trends in properties in the periodic table, with elements exhibiting well-characterised Homologous series, homologous behaviour. This family of elements is also known as the lithium family after its leading element. The alkali metals are all shiny, hardness, sof ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Astatine
Astatine is a chemical element; it has Symbol (chemistry), symbol At and atomic number 85. It is the abundance of elements in Earth's crust, rarest naturally occurring element in the Earth's crust, occurring only as the Decay chain, decay product of various heavier elements. All of astatine's isotopes are short-lived; the most stable is astatine-210, with a half-life of 8.1 hours. Consequently, a solid sample of the element has never been seen, because any macroscopic specimen would be immediately vaporized by the heat of its radioactivity. The bulk properties of astatine are not known with certainty. Many of them have been estimated from its position on the periodic table as a heavier analog of fluorine, chlorine, bromine, and iodine, the four stable halogens. However, astatine also falls roughly along the dividing line between metals and nonmetals, and some metallic behavior has also been observed and predicted for it. Astatine is likely to have a dark or lustrous appearanc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hadrian's Wall
Hadrian's Wall (, also known as the ''Roman Wall'', Picts' Wall, or ''Vallum Aelium'' in Latin) is a former defensive fortification of the Roman province of Roman Britain, Britannia, begun in AD 122 in the reign of the Emperor Hadrian. Running from Wallsend on the River Tyne in the east to Bowness-on-Solway in the west of what is now northern England, it was a stone wall with large ditches in front and behind, stretching across the whole width of the island. Soldiers were garrisoned along the line of the wall in large Castra, forts, smaller milecastles, and intervening Turret (Hadrian's Wall), turrets. In addition to the wall's defensive military role, its gates may have been customs posts. Hadrian's Wall Path generally runs close along the wall. Almost all the standing masonry of the wall was removed in early modern times and used for local roads and farmhouses. None of it stands to its original height, but modern work has exposed much of the footings, and some segments d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sacks2001
A sack usually refers to a rectangular-shaped bag. Sack may also refer to: Bags * Flour sack * Gunny sack * Hacky sack, sport * Money sack * Paper sack * Sleeping bag * Stuff sack * Knapsack Other uses * Bed, a slang term * Sack (band), an Irish band * Sack (comics), a Marvel Comics villain * Sack (surname), a surname * Sack (unit), an English unit of weight or mass used for coal and wool * Sack (wine), a type of white fortified wine * Sack, Zurich, a village in the Swiss canton of Zurich * Sacks (surname) * "Sacked" (''The Detectives''), a 1996 television episode * Sackcloth (Hebrew ''sak''), a fabric mentioned in the Bible * Selective acknowledgement (SACK), in computer networking * Ball sack, slang for scrotum * Dismissal (employment), slang term for being fired * Looting, the indiscriminate taking of goods by force, particularly during war * Quarterback sack, tackling the quarterback behind the line of scrimmage in American and Canadian football * Sack ''jacket'', a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Whitley2009
Whitley may refer to: Places ;United Kingdom *Whitley, Berkshire, a suburb of Reading *Whitley, Cheshire, a village near Warrington *Whitley, Coventry, a suburb of Coventry, West Midlands *Whitley, Essex, near Birdbrook * Whitley, Wigan, Greater Manchester, a location * Whitley, North Yorkshire, a village in the Selby district * Whitley, South Yorkshire, a location *Whitley, Wiltshire, a village in the civil parish of Melksham Without *Whitley Bay, a town in Tyne and Wear, known as Whitley until the 19th century * Whitley Lower and Whitley Upper, West Yorkshire ;United States *Whitley City, Kentucky *Whitley County, Indiana *Whitley County, Kentucky * Whitley Township, Moultrie County, Illinois In the military * Armstrong Whitworth Whitley, a British bomber of the Second World War * , a British destroyer in commission in the Royal Navy from 1918 to 1921 and from 1939 to 1940 Schools *Whitley Secondary School, Bishan, Singapore *Whitley Abbey Community School, Coventry, England ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DiSalvo2000
DiSalvo or Di Salvo is a surname. Notable people with the surname include: * Antonio Di Salvo (born 1979), Italian-German former footballer * DyAnne DiSalvo, American artist and author * Jason DiSalvo (born 1984), American motorcycle racer * Lino DiSalvo (born 1974), American animator, film director, writer and voice actor * Steve DiSalvo (born 1949), American professional wrestler * Steven DiSalvo (born 1962), American academic administrator * Valter Di Salvo (born 1963), Italian fitness coach formerly with Real Madrid and Manchester United {{surname ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Levy2011
Levy, Lévy or Levies may refer to: People * Levy (surname), people with the surname Levy or Lévy * Levy Adcock (born 1988), American football player * Levy Barent Cohen (1747–1808), Dutch-born British financier and community worker * Levy Fidelix (1951–2021), Brazilian conservative politician, businessman and journalist * Levy Gerzberg (born 1945), Israeli-American entrepreneur, inventor, and business person * Levy Li (born 1987), Miss Malaysia Universe 2008–2009 * Levy Mashiane (born 1996), South African footballer * Levy Matebo Omari (born 1989), Kenyan long-distance runner * Levy Mayer (1858–1922), American lawyer * Levy Middlebrooks (born 1966), American basketball player * Levy Mokgothu, South African footballer * Levy Mwanawasa (1948–2008), President of Zambia from 2002 * Levy Nzoungou (born 1998), Congolese-French rugby player, playing in England * Levy Rozman (born 1995), American chess IM, coach, and content creator * Levy Sekgapane (born 1990), So ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metalloids
A metalloid is a chemical element which has a preponderance of properties in between, or that are a mixture of, those of metals and nonmetals. The word metalloid comes from the Latin ''metallum'' ("metal") and the Greek ''oeides'' ("resembling in form or appearance"). There is no standard definition of a metalloid and no complete agreement on which elements are metalloids. Despite the lack of specificity, the term remains in use in the literature. The six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony and tellurium. Five elements are less frequently so classified: carbon, aluminium, selenium, polonium and astatine. On a standard periodic table, all eleven elements are in a diagonal region of the p-block extending from boron at the upper left to astatine at lower right. Some periodic tables include a dividing line between metals and nonmetals, and the metalloids may be found close to this line. Typical metalloids have a metallic appearance, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Periodic Table Of The Elements
The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows (" periods") and columns (" groups"). It is an icon of chemistry and is widely used in physics and other sciences. It is a depiction of the periodic law, which states that when the elements are arranged in order of their atomic numbers an approximate recurrence of their properties is evident. The table is divided into four roughly rectangular areas called blocks. Elements in the same group tend to show similar chemical characteristics. Vertical, horizontal and diagonal trends characterize the periodic table. Metallic character increases going down a group and from right to left across a period. Nonmetallic character increases going from the bottom left of the periodic table to the top right. The first periodic table to become generally accepted was that of the Russian chemist Dmitri Mendeleev in 1869; he formulated the periodic law as a depe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
