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Topic: Pauling scale

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Linus Pauling

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	Linus Pauling - Wikipedia, the free encyclopedia
		Pauling was a pioneer in the application of quantum mechanics to chemistry, and in 1954 was awarded the Nobel Prize in chemistry for his work describing the nature of chemical bonds.
		Pauling had formulated a model for the structure of hemoglobin in which atoms were arranged in a helical pattern, and applied this idea to proteins in general.
		Pauling also studied enzyme reactions and was among the first ones to point out that enzymes bring about reactions by stabilizing the transition state of the reaction, a view which is central to understanding their mechanism of action.
	en.wikipedia.org /wiki/Linus_Pauling (3267 words)

	[No title] (Site not responding. Last check: 2007-09-20)
		Two scales of electronegativity are in common use: the Pauling scale (proposed in 1932) and the Mulliken scale (proposed in 1934).
		The Pauling Scale is a widely used, empirical scale of electronegativity values, originally developed by Linus Pauling in 1932.
		On this scale, the most electronegative element (fluorine) is given a value of 4.0, while the least electronegative element (francium) is given a value of 0.7.
	www.online-encyclopedia.info /encyclopedia/e/el/electronegativity.html (271 words)

	Linus Carl Pauling, February 28, 1901—August 19, 1994 \| By Jack D. Dunitz \| Biographical Memoirs
		Pauling's name is probably best known among the general public through his advocacy, backed by personal example, of large doses of ascorbic acid (vitamin C) as a dietary supplement to promote general health and prevent (or at least reduce the severity of) such ailments as the common cold and cancer.
		Pauling was eager to apply the new wave mechanics to calculate properties of many-electron atoms and he found a way of doing this by using hydrogen-like single-electron wave functions for the outer electrons with effective nuclear charges based on empirical screening constants for the inner electrons.
		Pauling's ionic radii: Once the structures of simple inorganic crystals began to be established it was soon seen that the observed interatomic distances were consistent with approximate additivity of characteristic radii associated with the various cations and anions.
	www.nap.edu /readingroom/books/biomems/lpauling.html (10247 words)

	Chemical Sciences Dictionary: B (Site not responding. Last check: 2007-09-20)
		Pauling scale-- an empirical scale of electronegativity developed by the American chemist Linus Pauling.
		On the Pauling electronegativity scale, the most electronegative atoms (fluorine, F) is given the value 4.0 and the least electronegative atoms (lithium, Li, and the heavier alkali metals) are given values of 1.0 and below.
		In a polar bond, the majority of the electron density in the bond lies toward the atom of greater electronegativity.
	www.ualberta.ca /~jplambec/che/struct/gpidx.htm (85 words)

	Linus Pauling
		It was while he was studying at OAC that Pauling had first been exposed to quantum mechanics, and he was now interested in seeing how it might help in the understanding of Pauling's chosen field of interest, the electronic structure of atoms and molecules.
		Part of Pauling's work on the nature of the chemical bond led to his introduction of the concept of hybridization.
		Pauling also studied enzyme reactions and showed that sickle-cell anemia was caused by a single amino acid change in the hemoglobin molecule.
	www.sciencedaily.com /encyclopedia/linus_pauling (2150 words)

	Linus Pauling (Site not responding. Last check: 2007-09-20)
		Pauling died of prostate cancer on August 19, 1994 at the age of 93 in Big Sur, California.
		As a humanist, Pauling occupied a prominent position and was one of the important scientists of the post-war period who campaigned against nuclear disarmament.
		Pauling's work in orthomolecular medicine was more controversial and is still generating considerable debate.
	www.worldhistory.com /wiki/L/Linus-Pauling.htm (3206 words)

	Pauling scale (Site not responding. Last check: 2007-09-20)
		Two scales of electronegativity are in common use: the Pauling scale (proposed in 1932)and the Mulliken scale (proposed in 1934).
		On the Mulliken scale, numbers are obtained by averaging ionization potential and electronaffinity.
		Bonds between atoms with a large electronegativity difference(greater than or equal to 2.0 on the Pauling scale) are usually considered to be ionic, while values between 2.0 and 0.4 are considered polar covalent.
	www.therfcc.org /pauling-scale-10218.html (276 words)

	Linus Pauling (1901-1994)
		Pauling's success depended partly on his persistent probing of the unknown, as well as on his ability to cross scientific boundaries, both of which were necessary in his quest to elucidate the nature of chemical bonding.
		While the physicists regarded the new quantum theory as a solution to understanding physical events on an atomic scale, Pauling had a novel perspective, which used quantum mechanics to describe the structure of the electron orbitals, bond angles, bond energies, and interatomic distances.
		From his understanding of the chemical structure of hemoglobin, Pauling deduced that this clumping of blood may be caused by abnormal hemoglobin molecules that have mutually complementary regions, which would attract each other via weak intermolecular forces.
	www.accessexcellence.org /AB/BC/Linus_Pauling.html (597 words)

	wikien.info: Main_Page (Site not responding. Last check: 2007-09-20)
		Pauling was one of the first quantum chemists, and in 1954 was awarded the Nobel Prize in chemistry for his work describing the nature of chemical bonds.
		Pauling received the Nobel Peace Prize in 1962 for his campaign against above-ground nuclear testing, becoming one of only two people to receive the Nobel Prize in more than one field, the other being Marie Curie.
		Pauling later traveled to Europe to study under Arnold Sommerfeld in Munich, Niels Bohr in Copenhagen, and Erwin Schrödinger in Zürich.
	www.hostingciamca.com /index.php?title=Linus_Pauling (2310 words)

	Linus Pauling--Scientist for the Ages
		Pauling discovered that in many cases the type of bonding—whether ionic or covalent (formed by a sharing of electrons between bonded atoms)—could be determined from a substance's magnetic properties.
		Pauling's innovative concepts, published beginning in the late 1920s, together with numerous examples of their application to particular chemical compounds or compound groups gave chemists fundamental principles to apply to the growing body of chemical knowledge.
		Pauling's six-year unrelenting antitesting campaign was finally vindicated when a treaty was signed by the then-three nuclear powers—the U.S., Great Britain, and the U.S.S.R. On October 10, 1963, the day on which the limited test ban went into effect, it was announced that Linus Pauling would be awarded the Nobel Peace Prize for 1962.
	osu.orst.edu /dept/lpi/lpbio/lpbio2.html (4865 words)

	Electronegativity (Site not responding. Last check: 2007-09-20)
		Two scales of electronegativity are in common the Pauling scale (proposed in 1932) and the Mulliken scale (proposed in 1934).
		On this scale the most electronegative element (fluorine) is given a value of 4.0 the least electronegative element (francium) is given a value of 0.7.
		Bonds between atoms with a large difference (greater than or equal to 2.0 the Pauling scale) are usually considered to ionic while values between 2.0 and 0.4 considered polar covalent.
	www.freeglossary.com /Electronegativity (277 words)

	Electronegativity - Wikipedia, the free encyclopedia
		On this scale, the most electronegative element (fluorine) is given an electronegativity value of 3.98; the least electronegative element (francium) has a value of 0.7, and the remaining elements have values in between.
		Values below 0.4 are considered non-polar covalent bonds, and electronegativity differences of 0 indicate a completely non-polar covalent bond.
		The most strongly electronegative element, fluorine, has an electronegativity of 3.98 while weakly electronegative elements, such as lithium, have values close to 1.
	www.wikipedia.org /wiki/Pauling_scale (460 words)

	SingaporeMoms - Parenting Encyclopedia - Linus Pauling
		Linus Carl Pauling (February 28, 1901–August 19, 1994) was an American physical chemist, widely regarded as the premier chemist of the twentieth century.
		In 1932, he published what he regarded as his most important paper, in which he first laid out the concept of hybridization of atomic orbitals and analyzed the tetravalency of the carbon atom.
		However, this relationship was nipped in the bud when Pauling began to suspect that the theorist was probably becoming too close to his wife, Ava Helen; once when Pauling was at work, Oppenheimer had come to their place and blurted out an invitation to Ava Helen to join him on a tryst to Mexico.
	www.singaporemoms.com /parenting/Linus_Pauling (3048 words)

	Electronegativity
		Linus Pauling was presented the 1954 Nobel Prize in Chemistry "for his research into the nature of the chemical bond and its application to the elucidation of the structure of complex substances." Here is the presentation speech at the award ceremony in December, 1954 describing his work.
		After Pauling's initial announcement of his scale in 1932, others became involved in this area and developed electronegativity scales of their own.
		Others expanded the linear scale of pure covalent on one end and ionic on the other into a triangular plot with the three vertices being pure covalent, ionic, and metallic.
	dbhs.wvusd.k12.ca.us /webdocs/Bonding/Electroneg-development.html (757 words)

	Chemical Sciences: Unequal Sharing of Electrons Produces Polar Bonds
		The concept of electronegativity was made quantitative by Linus Pauling, an American chemist who has won two Nobel prizes (one for chemistry, one for peace).
		Pauling compared the bond enthalpies of the known homopolar (two identical atoms) and heteropolar (two different atoms) bonds of various elements, and from them calculated the values we now call the Pauling scale of electronegativities.
		Pauling scale has remained as the scale most chemists use.
	www.psigate.ac.uk /newsite/reference/plambeck/chem1/p01244.htm (418 words)

	Chemistry: WebElements Periodic Table : Periodic properties : Electronegativity (Pauling): Definition
		The Pauling scale is perhaps the most famous.
		Using this equation, Pauling found that the largest electronegativity difference was between Cs and F. Pauling set F arbitrarily at 4.0 (today, the value for F is set to 3.98) and this gives a scale in which the values for all other elements are less than 4 but still with a positive number.
		Pauling electronegativities are published in many sources and essentially identical data are to be found in references such as 4 and 5.
	www.webelements.com /webelements/properties/text/definitions/electroneg-pauling.html (477 words)

	Allred-Rochow scale - Wikipedia, the free encyclopedia
		The Allred-Rochow scale in chemistry is a measure of electronegativity.
		The quantity Z/r² correlates well with Pauling electronegativities and the two scales can be made to coincide by expressing the Allred-Rochow electronegativity as:
		Alternative scales are called the Mulliken scale and the Pauling scale.
	www.wikipedia.org /wiki/Allred-Rochow_scale (112 words)

	[No title]
		The calculations used to arrive at the numbers in the scale are complex.
		One of the major benefits of the scale is the simplicity of the numbers.
		The scale is based on Fluorine having the largest electronegativity with a value of 4.0.
	www.bcpl.net /~kdrews/propert.html (1315 words)

	Linus Pauling
		Linus Carl Pauling (February 28, 1901 - August 19, 1994) was an American physical chemist.
		It was here especially that Pauling's elctronegativity concept was particularly useful; the electronegativity difference between a pair of atoms will be the surest predictor of the degree of ionicity of the bond.
		Linus Pauling is one of only two people to have been awarded a Nobel Prize in more than one field, the other being Marie Curie.
	usapedia.com /l/linus-pauling.html (2023 words)

	Electronegativity Values of the Elements - General Chemistry Table
		All electronegativity values on the Pauling scale are positive numbers.
		Using this scale, the most electronegative elements are the halogens, oxygen, nitrogen, and sulfur.
		Elements with very different electronegativities (difference of 2 or more on the Pauling scale) tend to form ionic bonds, while elements of similar electronegativities (difference of less than 2) tend to form covalent bonds.
	chemistry.allinfoabout.com /features/electronegativity.html (251 words)

	Linus Pauling (Site not responding. Last check: 2007-09-20)
		Linus Carl Pauling (February 28, 1901-August 19, 1994) was an American physical chemist.
		In 1957, Pauling began a petition drive in cooperation with biologist Barry Commoner[?], who had studied radioactive strontium-90 in the milk teeth of children across North America and concluded that above-ground nuclear testing posed public health risks to the public in the form of radioactive fallout.
		In 1966, at the age of 65 when many people go into retirement, he began to champion the ideas of biochemist Irwin Stone[?], who proposed that massive doses of vitamin C could prevent colds.
	www.city-search.org /li/linus-pauling.html (2302 words)

	Noble Gas Electronegativity (Site not responding. Last check: 2007-09-20)
		Pauling's scale was developed before Xe's chemistry was known and so Pauling electronegativity tables do not have an entry for Xe typically (although I guess it is possible that he proposed a value for Xe in the 70s or 80s.
		There are several electronegativity scales in addition to Pauling's.
		The two best known are the Mullekin and Allred-Rochow scales, and there is a fourth one which is called the "spectroscopic electronegativity." The Allred-Rochow scale agrees pretty well trend-wise with the Pauling scale, and gives an electronegativity value of 2.4.
	www.newton.dep.anl.gov /askasci/chem03/chem03148.htm (391 words)

	Electronegativity - Encyclopedia, History and Biography (Site not responding. Last check: 2007-09-20)
		The most strongly electronegative element, fluorine, has an electronegativity of 4 while weakly electronegative elements, such as lithium, have values close to 1.
		The δEN indicates the ionic character of a bond.
		Bonds between atoms with a large electronegativity difference (greater than or equal to 1.7 on the Pauling scale) are usually considered to be ionic, while values between 1.7 and 0.4 are considered polar covalent.
	www.arikah.com /encyclopedia/Electronegative (351 words)

	COTW08
		Luckily, for introductory courses only one scale is really needed to put the concept to use: this is the Pauling scale, named after the two-time Nobel prize winning chemist Linus Pauling.
		According to this scale, fluorine is the most electronegative element, with a Pauling electronegativity of 4.0.
		The least electronegative element is cesium, with a Pauling electronegativity of 0.7.
	www2.yk.psu.edu /~jhb3/cotw08.htm (3052 words)

	TopNotch Scales Digital Scales (Site not responding. Last check: 2007-09-20)
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	www.topnotchscales.com (173 words)

	eLibrary Project : Electronegativity (Site not responding. Last check: 2007-09-20)
		Fluorine,F: 4.0 On the Pauling scale, hydrogen is arbitrarily assigned a value of 2.1 or 2.2.
		Each chemical element,element has a characteristic electronegativity ranging from 0 to 4 on the Pauling scale.
		Bonds between atoms with a large electronegativity difference (greater than or equal to 1.7 on the Pauling scale) are usually considered to be ionic bond,ionic, while values between 1.7 and 0.4 are considered polar covalent bond,covalent.
	elibraryproject.com /info/Electronegativity.html (445 words)

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