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	PERIODIC LAW
		The chemical law that the properties of all the elements are periodic functions of their atomic weights was developed independently by two chemists: in 1869 by Dmitry Mendeleyev, a Russian, and in 1870 by Julius Lothar Meyer, of Germany.
		In the periodic classification, noble gases, which in most cases are unreactive (valence = 0), are interposed between highly reactive metals that form compounds in which their valence is +1 on one side and highly reactive nonmetals forming compounds in which their valence is -1 on the other side.
		The periodic law has been found to correlate a great many different properties of the elements, including such physical properties as melting and boiling points, densities, crystal structures, hardness, electrical conductivity, heat capacity, and thermal conductivity, and such chemical properties as reactivity, acidity or basicity, valence, polarity, and solubility.
	dwb.unl.edu /Teacher/NSF/C04/C04Links/www.fwkc.com/encyclopedia/low/articles/p/p019000875f.html (1573 words)

	History of the periodic table - Wikipedia, the free encyclopedia
		Alexandre-Émile Béguyer de Chancourtois, a French geologist, was the first person to notice the periodicity of the elements — similar elements seem to occur at regular intervals when they are ordered by their atomic weights.
		Newlands' work was heavily criticized, even ridiculed, by other chemists, because of the lack of spaces for undiscovered elements and the placing of two elements in one box, but he was finally awarded the Davy Medal by the Royal Society in 1887.
		Curiously, Walter Russell produced yet another periodic table in 1926, complaining that the widely accepted table did (as it does indeed) have gaps and exceptions which are not scientific.
	en.wikipedia.org /wiki/Periodic_law (1452 words)

	The Columbia Encyclopedia, Sixth Edition: periodic law @ HighBeam Research (Site not responding. Last check: 2007-11-06)
		PERIODIC LAW [periodic law] statement of a periodic recurrence of chemical and physical properties of the elements when the elements are arranged in order of increasing atomic number.
		He proposed in 1869 that the properties of elements are periodic functions of the atomic weight and grouped the elements accordingly in a periodic system.
		The periodic law can be explained on the basis of the electronic structure of the atom, which is believed to be the main factor underlying the chemical properties and many of the physical properties of the elements.
	www.highbeam.com /library/doc0.asp?DOCID=1E1:periodlw&refid=ip_encyclopedia_hf (716 words)

	PERIODIC LAW AND TABLE (Site not responding. Last check: 2007-11-06)
		The great value of the periodic law was made evident by Mendeleyev's success in 1871 in finding that the properties of 17 elements could be correlated with those of other elements by moving the 17 to new positions from those indicated by their atomic weights.
		The long-period form of the periodic system of the elements contains all of the chemical elements that have been discovered or made; they are arranged, in the order of their atomic numbers, in seven horizontal periods, with the lanthanons (lanthanum, 57, to lutetium, 71) and the actinons (actinium, 89, to lawrencium, 103) indicated separately below.
		The periodicity in properties of the elements arranged in order of atomic number is strikingly shown by the consideration of the physical state of the elementary substances and such related properties as the melting point, density, and hardness.
	www.britannica.com /nobel/macro/5001_20_45.html (3756 words)

	History of the Periodic Table to the latest developments (Site not responding. Last check: 2007-11-06)
		Mendeleyev published his periodic table and law in 1869 and forecast the properties of missing elements, and chemists began to appreciate it when the discovery of elements predicted by the table took place.
		Periodic table have always been related to the way scientists thought about the shape and structure of the atom, and has changed accordingly.
		The Periodic Law revealed important analogies among the 94 naturally occurring elements, and stimulated renewed interest in Inorganic Chemistry in the nineteenth century which has carried into the present with the creation of artificially produced, short lived elements of `atom smashers' and supercolliders of high energy physics.
	periodictable.com /pages/AAE_History.html (676 words)

	Periodic Table - Model Science Software
		His periodic law states that the chemical and physical properties of the elements vary in a periodic way with their atomic weights.
		The 38 elements in groups 3 through 12 of the periodic table are called "transition metals." As with all metals, the transition elements are both ductile and malleable, and conduct electricity and heat.
		All of the rare earth metals are found in group 3 of the periodic table, and the 6th and 7th periods.
	modelscience.com /PeriodicTable.html (571 words)

	Mendeleïev : article 1889
		The law of periodicity was thus a direct outcome of the stock of generalisations and established facts which had accumulated by the end of the decade 1860-1870: it is an embodiment of those data in a more or less systematic expression.
		The periodic law has demonstrated that the maximum extent to which different non-metals enter into combination with oxygen is determined by the extent to which they combine with hydrogen, and that the sum of the number of equivalents of both must be equal to 8.
		The line of argument which is inspired by the periodic law, so far from being weakened by the discovery of peroxides, is thus actually strengthened, and we must hope that a further exploration of the region under consideration will confirm the applicability to chemistry generally of the principles deduced from the periodic law.
	chimie.scola.ac-paris.fr /sitedechimie/hist_chi/text_origin/mendeleiev/mendel.htm (7174 words)

	periodic law. The Columbia Encyclopedia, Sixth Edition. 2001-05 (Site not responding. Last check: 2007-11-06)
		statement of a periodic recurrence of chemical and physical properties of the elements when the elements are arranged in order of increasing atomic number.
		Mendeleev was the first to state the periodic law close to its present form.
		The work (1913–14) of H. Moseley on the X-ray spectra of elements (see X ray) led to the present form of the periodic law.
	www.bartleby.com /65/pe/periodlw.html (705 words)

	The Periodic Table
		In 1898, William Ramsey suggested that argon be placed into the periodic table between chlorine and potassium in a family with helium, despite the fact that argon's atomic weight was greater than that of potassium.
		Although Mendeleev's table demonstrated the periodic nature of the elements, it remained for the discoveries of scientists of the 20th Century to explain why the properties of the elements recur periodically.
		The question of why the periodic law exists was answered as scientists developed an understanding of the electronic structure of the elements beginning with Niels Bohr's studies of the organization of electrons into shells through G.N. Lewis' (see a picture) discoveries of bonding electron pairs.
	www.wou.edu /liberalartsscience/physical_science/ch412/perhist.htm (1833 words)

	Periodic Law
		A period is a horizontal row of elements in the table.
		This is a manifestation of the periodicity exhibited by the elements between their atomic weights and their property measurements.
		There were some inconsistencies in the arrangement of the elements according to his law, however it wasn't until the early 1900's (1914) that a Prof Moseley, a British Physicist, was able to determine the atomic numbers of all the known elements using an experimental technique.
	members.aol.com /profchm/periodic.html (1338 words)

	Periodic Table - Trends
		Periodic Law states that the properties of elements repeat ___________________ when the elements are arranged in ___________________ order by their atomic numbers.
		Use the position in the periodic table to determine the number of valence electrons in the elements: Be, Ga, As, and F. 2c.
		So far you have seen that the periodic table was organized to illustrate the repetitive nature of the properties of the elements.
	www.avon-chemistry.com /p_table_lecture.html (1745 words)

	About the Periodic Table Website (Site not responding. Last check: 2007-11-06)
		This website is an interactive periodic table with a comprehensive database of element properties, which can be searched and collated in novel and useful ways.
		The rectangular periodic table is familiar to anybody who has ever been in a science laboratory or classroom.
		In it, the periodic relationship between chemical groups, that is, elements with a similar stoichiometry of reaction, is clearly illustrated.
	chemlab.pc.maricopa.edu /periodic/about.html (679 words)

	Development of Periodic Table
		In 1829 Dobereiner proposed the Law of Triads: Middle element in the triad had atomic weight that was the average of the other two members.
		Newlands was the first to formulate the concept of periodicity in the properties of the chemical elements.
		Lord Rayleigh (1842-1919) and William Ramsey (1852-1916) greatly enhanced the periodic table by discovering the "inert gases." In 1895 Rayleigh reported the discovery of a new gaseous element named argon.
	web.fccj.org /~ethall/period/period.htm (976 words)

	sciforums.com - Periodic law
		Would the 2 new periods work within the current mathematics, the proton would have -1 electrons and the neutron 0 electrons.
		The periodic table is structured according to the configurations of electrons around the nuclei of atoms.
		What you want is not a periodic table, but a table of isotopes (which you can find on the web and elsewhere).
	www.sciforums.com /showthread.php?t=20207 (380 words)

	Mendeleev's Periodic Chart
		You are asked to place the "unknowns" in appropriate positions in their respective families by correlating the properties of these elements with the properties of the "knowns" in each family.
		When Mendeleev constructed his periodic chart he grouped the elements in families because these elements showed similar chemical and physical properties.
		By referring to the periodic table in you text or the one on the wall in the room, identify each of the unknowns in part A by its appropriate symbol or formula.
	chem.lapeer.org /Chem1Docs/Mendeleev.html (677 words)

	periodic law -- Encyclopædia Britannica
		Newlands was one of the first to detect a periodic pattern in the properties of the elements and anticipated...
		The law is named in honour of André-Marie Ampère, who by 1825 had laid the foundation of electromagnetic theory.
		in physics, any of the statements (originally formulated in 1913) that radioactive decay produces daughter atoms whose position in the periodic table of the chemical elements is shifted from that of their parents: two lower for alpha decay and one higher for negative beta decay.
	www.britannica.com /eb/article-9110603 (779 words)

	Lesson 3-4 The Periodic Table
		It was not until 1914 that Henry Moseley corrected the periodic law, based on his discovery of the atomic numbers of several elements.
		By looking at the period that the element is found in, you can determine the energy level which the valence shell is found.
		Oxygen (O) is found in the second period, and in the fourth column of the p section.
	www.fordhamprep.com /gcurran/sho/sho/lessons/lesson34.htm (1058 words)

	The Columbia Encyclopedia, Sixth Edition: periodic law@ HighBeam Research (Site not responding. Last check: 2007-11-06)
		The periodic payment d is given by (see Appendix)...
		with the rule of law and the sovereignty...
		College since 1977has shown that the periodic law applies at least to...
	www.highbeam.com /ref/doc0.asp?docid=1E1:periodlw (871 words)

	Periodic Table Of Elements-Mendeleev's periodic table-
		Newland’s law is not applicable to all the elements.
		Which is against his periodic law but correct according to properties.
		Lanthanide and Actinide have been assigned places in the periodic table which is against the periodic law.
	www.citycollegiate.com /periodictable.htm (824 words)

	Dmitrii Mendeleev (Site not responding. Last check: 2007-11-06)
		Having grown, during the times of the alchemists up to the period when experimental proof was required, the idea has rendered good service; it induced those careful observations and experiments which later on called into being the works of Scheele, Lavoisier, Priestley and Cavendish.
		I need but mention the brilliant discovery of gallium, which proved to correspond to eka-aluminium of the periodic law, by Lecoq de Boisbaudran; of scandium, corresponding to eka-boron, by Nilson; and of germanium, which proved to correspond in all respects to eka-silicium, by Winckler.
		Later on, Carnelley, Laurie, L. Meyer, Roberts-Austen, and several others applied the periodic system to represent the order in the changes of the magnetic properties of the elements, their melting points, the heats of formation of their haloid compounds, and even of such mechanical properties as the coefficient of elasticity, the breaking stress, &c., &c.
	web.lemoyne.edu /~giunta/mendel.html (7182 words)

	Dmitriy Mendeleev Online
		Extract from the first Mendeleev's paper about the Periodic Law "The Relation between the Properties and Atomic Weights of the Elements", Journal of the Russian Chemical Society, 1, 60-77 (1869) [Engl.
		"The Periodic Law of the Chemical Elements", Faraday Lecture of Mendeleev, Journal of the Chemical Society, 55, 634-56 (1889).
		Dmitri Mendeleyev and the Discovery of the Periodic Law by J.Tennenbaum from The American Almanac.
	www.chem.msu.su /eng/misc/mendeleev/welcome.html (481 words)

	[No title]
		To discover the periodic trends of certain physical properties of elements related to their position on the Periodic Table of Elements.
		The Periodic Table is arranged according to the Periodic Law.
		The Periodic Law states that when elements are arranged in order of increasing atomic number, their physical and chemical properties show a periodic pattern.
	www.lynchburg.net /hhs/chemistry/trends/main.htm (517 words)

	Dmitri Mendeleev ~ History of the periodic table
		Mendeleev is best known for his work on the periodic table; arranging the 63 known elements into a Periodic Table based on atomic mass, which he published in Principles of Chemistry in 1869.
		Dmitri Mendeleev was born at Tobolsk, Siberia in 1834 and died in 1907.
		Also see Henry Moseley [1887-1915] Because of Moseley's work, the modern periodic table is based on the atomic numbers of the elements.
	www.chemistry.co.nz /mendeleev.htm (390 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		Mendeleev, a Russian chemist, developed the periodic law, a necessary law in chemistry.
		The Periodic law says that the chemical elements are arranged according to their atomic weight.
		And using the periodic law, he predicted the properties of the elements that were missing.
	www.st-agnes.org /~lstinson/webpages/table.htm (360 words)

	DR. LAWSON'S INTRODUCTORY CHEMISTRY PAGE
		State/recognize the position on the Periodic Table of those elements that are known as “nonmetals” and identify and/or describe the characteristics of nonmetals.
		Given a modern Periodic Table of the Elements, recognize the elements’; atomic numbers and atomic mass numbers and, from these numbers, determine the numbers of electrons, protons, and neutrons that would be found in the most abundant isotopes of those elements (or the most stable isotopes of those elements).
		He proposed that the Periodic Law of Mendeleev be modified to state that “the properties of the elements are a regularly repeating function of their atomic numbers.”; This arrangement is what is presently used to organize the modern Periodic Table of the Elements.
	www.colin.edu /science/DL_FOLDER/CHEM_OBJ_FOR_TOPIC_6-DL.htm (2045 words)

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