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Topic: History of the periodic table

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	Interactive Periodic Table
		See also essay on the periodic table, a chart of the chemical elements, and the science section of the Homework Center.
		The nature of things: attempts to change the periodic table raise eyebrows.
		Upper limit of the periodic table and synthesis of superheavy elements.
	www.infoplease.com /periodictable.php (105 words)

	Periodic table - Wikipedia, the free encyclopedia
		The periodic table of the chemical elements is a tabular method of displaying the chemical elements, first devised in 1869 by the Russian chemist Dmitri Mendeleev.
		A period is a horizontal row in the periodic table of the elements.
		Stephen Hawking's Universe - 03 - PBS documentary on the history of the periodic table and the cosmic evolution of the elements.
	en.wikipedia.org /wiki/Periodic_table (2214 words)

	History of the periodic table - Wikipedia, the free encyclopedia
		Alexandre-Emile 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.
		Some people consider Meyer and Mendeleev the cocreators of the periodic table, although most agree that Mendeleev's accurate prediction of the qualities of the undiscovered elements lands him the larger share of credit.
		Moseley's research also showed that there were gaps in his table at atomic numbers 43 and 61 which are now known to be radioactive and not naturally occurring.
	en.wikipedia.org /wiki/History_of_the_periodic_table (1429 words)

	NationMaster - Encyclopedia: History of the periodic table (Site not responding. Last check: )
		Portrait of Monsieur Lavoisier and his Wife, by Jacques-Louis David The history of chemistry may be said to begin with the distinction of chemistry from alchemy by Robert Boyle in his work The Skeptical Chymist, which was written after a long and tearfilled talk with his father, and alchymist...
		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.
		The periodic table is now ubiquitous within the academic discipline of chemistry, providing an extremely useful framework to classify, systematize and compare all the many different forms of chemical behaviour.
	www.nationmaster.com /encyclopedia/History-of-the-periodic-table (2963 words)

	About the Periodic Table Website (Site not responding. Last check: )
		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.
		Periodic table art, music and educational games are available.
		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)

	The Periodic Table
		A necessary prerequisite to the construction of the periodic table was the discovery of the individual elements.
		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.
	www.wou.edu /las/physci/ch412/perhist.htm (1833 words)

	History of the Periodic Table to the latest developments (Site not responding. Last check: )
		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 `modern' periodic table is very much like a later table by Meyer, arranged, as was Mendeleyev's, according to the size of the atomic weight, but with Group 0 added by Ramsay.
	www.periodictable.com /pages/AAE_History.html (676 words)

	Periodic Table ADventure
		Dmitri Mendeleev, a Russian scientist born in Tobolsk, Siberia in 1834, is known as the father of the periodic table of the elements.
		The periodic table of the elements is an important tool used by students and chemists around the world to help them understand and simplify the often complex world of chemical reactions.
		The word "periodic" means that there is a repeating pattern -- that is, the properties of the elements repeat with each row -- or period -- of the table.
	web.buddyproject.org /web017/web017/history.html (592 words)

	History of the periodic table - The Jiggies Reference Guide (Site not responding. Last check: )
		During this time, fluorine was added to the halogen group and oxygen, sulphur, selenium, and tellurium were grouped into a family, forming two tetrads; and nitrogen, phosphorus, arsenic, antimony, and bismuth were recognised as forming a petad.
		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.
		Dmitri Mendeleev, a Siberian-born Russian chemist, was the first scientist to make a periodic table much like the one we use today.
	www.jiggies.com /reference/Periodic_table_history (972 words)

	BBC - h2g2 - The History of the Periodic Table of the Elements - A593642
		His work finally led to the development of the periodic table of the elements, as it is known today.
		The periodic table of the elements was reorganised to accommodate this new and ingenious theory, adopting the form it has today.
		The original sorting according to the molecular weight was dropped in favour of the more logical sorting according to the atomic number (which is the charge of the nucleus, or the amount of protons it is made of) and the groups were arranged according to their electronic configuration.
	www.bbc.co.uk /dna/h2g2/alabaster/A593642 (767 words)

	History of the Periodic Table
		History of the Periodic Table of the Elements
		Compiled a Periodic Table of 56 elements based on the periodicity of properties such as molar volume when arranged in order of atomic weight.
		Mendeleev's Periodic Table was important because it enabled the properties of elements to be predicted by means of the 'periodic law': properties of the elements vary periodically with their atomic weights.
	www.ausetute.com.au /pthistor.html (458 words)

	Facts about the Periodic Table
		Dimitri Mendeleev, the father and inventor, of the Periodic Table, was born on February 7, 1834 in Tobolsk, Siberia in Russia.
		Mendeleev then went further, using the remaining gaps and spaces in his periodic table, he correctly concluded that a group of yet unknown elements must exist to fill in the gaps in the Periodic Table, this was the group we now know as the lanthanides.
		Fifty years after Dimitri Mendeleev created the Periodic table, the British scientist Henry Moseley discovered that the number of protons in the nucleus of a particular type of atom was always the same.
	www.facts-about.org.uk /science-periodic-table.htm (579 words)

	The Periodic Table of Elements (Site not responding. Last check: )
		The "periodic" nature of chemical properties that Mendeleev had discovered is related to the electron configuration of the atoms of the elements.
		The row, or period, number that an element resides in on the table is equal to the number of total shells that contain electrons in the atom.
		H and He in the first period normally have electrons in only the first shell; Li, Be, B, and other period-two elements have two shells occupied, and so on.
	www.visionlearning.com /library/module_viewer.php?mid=52 (856 words)

	History of the Development of the Periodic Table (Site not responding. Last check: )
		The periodic table was proposed by Russian chemist Dimitri Mendeleev in 1869.
		The periodic table was included in H.G. Deming's 1923 text book and was used as an advertising device by Merck and Co. a few years later.
		By the 1930s, the periodic table was a common inclusion in chemistry and physics texts.
	www.upei.ca /~physics/p221/pro00/periodicTble/page2.html (438 words)

	The History Of the Periodic Table.
		Elements in horizontal periods have the same principal quantum, n, indicating the number of electron shells in the atom.
		Some variations of the traditional table have been proposed but many were unsuccessful in supplanting the traditional table.
		The triangular shape allows the lanthanides and actinides to be included in the main body of the table in a position according to their atomic number.
	www.studentcentral.co.uk /history_the_periodic_table_11063 (456 words)

	Erik's Chemistry: Historical Development of the Periodic Table
		Mendeleev stated that the elements vary periodically (in cycles) according to their atomic masses.
		Meyer was the first scientist to introduce the concept of valence as a periodic property.
		Periodic Law - The properties of the chemical elements are a periodic function of atomic number.
	members.tripod.com /~EppE/historyp.htm (406 words)

	periodic table
		The periodic table is a classification scheme of the elements.
		The periodic table is constructed in a way that reflects the distribution of electrons in the atoms of the elements.
		One reason that the periodic table is valuable, is that there are many patterns in it that allow a knowledgeable person to use it as a tool.
	cuip.uchicago.edu /www4teach/97/crothe/periodictable.html (742 words)

	Essay: The History of the Periodic Table. - Coursework.Info
		The organization of the modern periodic table is perhaps one of the most significant tasks undertaken in chemistry.
		The term periodic came from the regular occurrence of certain chemical properties in the list of known elements when these are arranged in order of increasing relative mass.
		The rectangular periodic table is familiar to anybody who gas ever been in a science laboratory or classroom.
	www.coursework.info /i/60740.html (253 words)

	History of the periodic table
		This table was the first coherent presentation of the similarities between elements.
		He noticed that classifying the elements by their atomic mass a periodicity in certain properties could be seen.
		In this table, the elements are classified vertically (in the current classification they are arranged horizontally).
	www.lenntech.com /Periodic-chart-elements/history-periodic-table.htm (694 words)

	Development of Periodic Table (Site not responding. Last check: )
		The development of the periodic table begins with German chemist Johann Dobereiner (1780-1849) who grouped elements based on similarities.
		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.
	mooni.fccj.org /~ethall/period/period.htm (976 words)

	History of the periodic table (Site not responding. Last check: )
		With the elements arrangedin a spiral on a cylinder by order of increasing atomic weight, de Chancourtois saw that similar elements lined up vertically.His paper was published in 1862, but used geological rather than chemical terms and did not include a diagram; as a result, itreceived little attention until the work of Dmitri Mendeleev.
		Dmitri Mendeleev, a Siberian-born Russian chemist, was the firstscientist to make a periodic table much like the one we use today.Mendeleev arranged the elements in a table ordered by atomic mass.
		An English chemist, William Odling, also drew up a table that is remarkably similar to that of Mendeleev in 1864.Mendeleev predicted the discovery of other elements and pointed out that some of the then-current atomic weights were incorrect.He provided for variance from atomic weight order, left space for new elements, and predicted three undiscovered elements.
	www.therfcc.org /history-of-the-periodic-table-80493.html (923 words)

	Open Directory - Science: Chemistry: Periodic Table (Site not responding. Last check: )
		David's Whizzy Periodic Table - Applet-based table with visualizations of the electron shell model, the nucleus, the visual emission spectrum, and energy levels of the electrons.
		Periodic table - Printable Interactive periodic table of the elements, chemistry data tables and pictures of elements.
		Periodic Table of the Elements - [Basic data, includes printable version] Information on each of the chemical elements and data on their properties.
	www.dmoz.org /Science/Chemistry/Periodic_Table (1476 words)

	Essay: The History of The Periodic Table. - Coursework.Info
		The History of The Periodic Table There are a huge amount of elements known to mankind, each of which has individual properties and a relative atomic mass.
		Altogether this accumulates to be an awful lot of data, so it is not surprising that from very early on in history, scientists tried to put all of this data together in a table, which would display necessary properties in an organised manner.
		Although it would seem logical to put them in a table of their properties such as boiling point, in the early 19th century, a German chemist called Johann Döbereiner noticed a very prominent pattern when it came to the elements' relative atomic masses.
	coursework.info /.../The_History_of_The_Periodic_Table_L55264.html (264 words)

	History of the Periodic Table of the Elements (Site not responding. Last check: )
		The actual discovery of the periodic law was in 1868-1870 by Lothan Meyer (Germany) and Dmitry Ivanorich Mendeleyev (Russia).
		Meyer arranged 57 elements known to him in in order of atomic weights, leaving blank spaces where properties of elements seemed to indicate one was missing.Concerned with physical properties such as atomic volumes, and similar values of these recurned periodically after every 7th element in his table.
		Meyer drew his his first periodic table in 1868 and pulished it in 1870.
	www.sof.edu /gallery/Christie/AhmadCo/history.html (315 words)

	History Of The Periodic Table
		Also throughout those 100 years another scientist put the table of elements into a cylindrical form and proved that the elements in the same groups are very similar to each other, having quite similar properties.
		The elements in the periodic table are arranged in groups and periods.
		The elements are placed on the periodic table in numeric order of their atomic number so therefore the electrons go up by 1 each element across.
	www.doingmyhomework.com /show_essay/1667.html (355 words)

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