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Topic: Periodic table period

	Chemistry: WebElements Periodic Table
		The periodic "law" of chemistry recognises that many properties of the chemical elements are periodic functions of their atomic number (the number of protons within the element's atomic nucleus).
		The periodic table is an arrangement of the chemical elements ordered by atomic number in columns (groups) and rows (periods) presented so as to emphasize their periodic properties.
		The relative merits of various other periodic table organisations is still the subject of debate.
	www.webelements.com (426 words)

	Periodic Table - Printer-friendly - MSN Encarta
		Periodic Table, table of the chemical elements arranged to illustrate patterns of recurring chemical and physical properties.
		The periodic table has been published in various shapes and sizes, but the most commonly used modern form begins with a column of group 1 metals on the left-hand side, followed by a column of group 2 alkaline earth metals.
		His version of the table was the first to accommodate all the known elements and also successfully predicted the existence of several elements that had not yet been discovered.
	encarta.msn.com /text_761586387___0/Periodic_Table.html (1146 words)

	Periodic Table - MSN Encarta
		Introduction; Arrangement of the Table; Uses of the Periodic Table; History
		Elements, such as oxygen, iron, and gold, are the most basic chemical substances and cannot be broken down by chemical reactions.
		A number of chemists contributed to the development of the periodic table during the 19th century; however, Mendeleyev is regarded as the primary discoverer.
	encarta.msn.com /encyclopedia_761586387/Periodic_Table.html (1194 words)

	periodic table. The Columbia Encyclopedia, Sixth Edition. 2001-05
		In the periodic table the elements are arranged in columns and rows according to increasing atomic number (see the table entitled Periodic Table).
		This is in keeping with current interpretations of the periodic law which holds that the elements in a group have similar configurations of the outermost electron shells of their atoms.
		The elements of a period are characterized by the fact that they have the same number of electron shells; the number of electrons in these shells, which equals the element’s atomic number, increases from left to right within each period.
	www.bartleby.com /65/pe/periodtbl.html (600 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)

	EIA Kids Page - A Periodic Table of the Elements
		The periodic table is the most important reference a chemist has because it puts all the known elements into a meaningful pattern.
		The period number of an element signifies the highest energy level an electron in that element occupies (in the unexcited state).
		The number of elements in a period increases as one moves down the periodic table because as the energy level of the atom increases, the number of energy sub-levels per energy level increases.
	www.eia.doe.gov /kids/energyfacts/science/periodictable.html (199 words)

	Periodic Table and Atomic Properties
		Periodic Table - A tabular arrangement of elements in rows (periods) and columns (groups) in the order of their atomic numbers.
		A period consists of the elements in any one horizontal row of the periodic table.
		When the elements are arranged by atomic number in the periodic table, their physical and chemical properties vary periodically.
	www.molecularsoft.com /data/help/Periodic_Table-Element_Properties.htm (657 words)

	P - Glossary of chemical terms
		Periodic table is a table of the elements, written in sequence in the order of atomic number or atomic weight and arranged in horizontal rows (periods) and vertical columns (groups) to illustrate the occurrence of similarities in the properties of the elements as a periodic function of the sequence.
		Periods are horizontal rows in the periodic table.
		Each period beginning with an alkali metal (one electron in the outermost principal quantum level) and ending with an noble gas (each having eight electrons in the outermost principal quantum level, except for helium, which is limited to two).
	www.ktf-split.hr /periodni/en/abc/p.html (922 words)

	Encyclopedia: Periodic table period (Site not responding. Last check: 2007-11-06)
		In the periodic table of the elements, a period is a row of the table.
		A period 4 element is one of the chemical elements in the fourth row (or period) of the periodic table of the elements.
		A period 7 element is one of the chemical elements in the seventh row (or period) of the periodic table of the elements.
	www.nationmaster.com /encyclopedia/Periodic-table-period (2166 words)

	Periodic table - Wikipedia, the free encyclopedia
		The periodic table of the chemical elements, also called the Mendeleev periodic table, is a tabular display of the known chemical elements.
		A group is a vertical column in the periodic table of the elements.
		Mendeleev was later vindicated by the discovery of the electronic structure of the elements in the late 19th and early 20th century.
	en.wikipedia.org /wiki/Periodic_table (1496 words)

	Encyclopedia: Periodic table group (Site not responding. Last check: 2007-11-06)
		A periodic table group is a vertical column in the periodic table of the chemical elements.
		It is no accident that several of these correspond directly to chemical series: the periodic table was originally created to organize the known chemical series into a single coherent scheme.
		The modern explanation of the pattern of the periodic table is that the elements in a group have similar configurations of the outermost electron shells of their atoms: as most chemical properties are dominated by outer electron interactions, this tends to give elements in the same group similar physical and chemical properties.
	www.nationmaster.com /encyclopedia/Periodic-table-group (3003 words)

	Periodic table period (Site not responding. Last check: 2007-11-06)
		Periodic Table ADventure [No data] Includes the history of the periodic table and information on the structure of atoms and the periodic table.
		Periodic Table ADventure Includes the history of the periodic table and information on the structure of atoms and the periodic table.
		The Pictorial Periodic Table [Basic data, very basic writeups, some pictures] Includes a printable periodic table, a cross-referenced list of nuclides, alternate styles, history, references, and many links to periodic table resources on the web.
	www.serebella.com /encyclopedia/article-Periodic_table_period.html (471 words)

	AllRefer.com - periodic table (Chemistry) - Encyclopedia
		periodic table, chart of the elements arranged according to the periodic law discovered by Dmitri I. Mendeleev and revised by Henry G. Moseley.
		In the periodic table the elements are arranged in columns and rows according to increasing atomic number (see the table entitled Periodic Table).
		The elements of a period are characterized by the fact that they have the same number of electron shells; the number of electrons in these shells, which equals the element's atomic number, increases from left to right within each period.
	reference.allrefer.com /encyclopedia/P/periodtbl.html (394 words)

	Teachers' Domain: Periodic Table of the Elements
		At first glance, the periodic table -- that chart that appears on the walls of science classrooms everywhere -- appears to be an oddly shaped collection of chemical information about the elements.
		A closer look, however, reveals the source of the table's name: The elements are arranged "periodically;" that is, according to properties that repeat in regular, predictable patterns.
		Elements are arranged in the periodic table according to atomic number, from left to right, top to bottom.
	www.teachersdomain.org /6-8/sci/phys/matter/ptable/index.html (1108 words)

	Periodic Table of the Elements
		The periodic table was invented by the Russian chemist Dmitri Mendeleyev (1834-1907), which he published in Principles of Chemistry in 1869.
		His periodic table arranged the 63 known chemical elements in order of their atomic mass.
		Today, the elements in the periodic table are ordered by their atomic number.
	periodictable.mysterymaster.com /report.html (1316 words)

	The Periodic Table of Elements
		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)

	ipedia.com: Periodic table Article (Site not responding. Last check: 2007-11-06)
		The periodic table of the chemical elements is a tabular display of the known chemical elements.
		Finally, in 1869, the German Lothar Meyer and the Russian chemist Dmitry Ivanovich Mendeleev almost simultaneously developed the first periodic table, arranging the elements by mass.
		Jacobs, Bob, "Periodic Tables (in case you were thinking that the Internet needed one more)".
	www.ipedia.com /periodic_table_1.html (847 words)

	Periodic Table
		The statement that there is a periodic repetition of chemical and physical properties of the elements when they are arranged by increasing atomic number is called the periodic law.
		The periodic table is organized in periods (rows from left to right) and groups (columns from top to bottom) by increasing atomic number.
		The period number represents the principal quantum number (n) and relates to the energy level of the atom's valence electrons.
	www.msu.edu /~napoli13/Units/periodictable.htm (515 words)

	CM1 INTERNET PROJECT:THE PERIODIC TABLE
		Each period is numbered according to how many occupied energy shells the elements in it have, so, although the elements considered on this page are known as the first row elements, they actually fall in period 2, hydrogen and helium being the only element in period 1.
		Although Mendeleev's table is by far the most practical and widely used, there has been some other tables made, for instance Stowe's physicists periodic table (1988), Benfey's periodic spiral (1960) and Zmaczynski's periodic triangle (1935).
		A periodic table which specialises in the history of the elements.
	www.chm.bris.ac.uk /webprojects1997/KeiraS/Welcome.htm (662 words)

	PERIOD, The Model 100 Periodic Table Program - History
		PERIOD is BASIC program that can search and display information from the Table of Periodic Properties of the Elements, also known simply as the Periodic Table.
		PERIOD was written to not only test the graphics capability of the Model 100, but also to demonstrate a practical application running on the system.
		An initial version of PERIOD with an abbreviated periodic table was written in August of 1982.
	nemesis.lonestar.org /computers/tandy/software/apps/model100/period/history.html (2447 words)

	BBC - 16+ SOS Teacher - Chemistry Laboratory Chemistry period 3 of the periodic table (Site not responding. Last check: 2007-11-06)
		In moving across the Periodic Table the nature of the elements changes from metallic to semi-conductor to non-metallic.
		In the middle of the Periodic Table the situation is less clear-cut.
		In general, the metallic character of an element increases towards the lower left-hand corner of the Periodic Table, due the increasing ease of ionisation of outer shell electrons.
	www.bbc.co.uk /schools/16/sosteacher/chemistry/50196.shtml (380 words)

	The Periodic Table
		Identify elements in various regions of the Periodic Table: metals, nonmetals, metalloids, alkali metals, alkaline earth metals, halogens, noble gases, transition elements, inner transition elements, lanthanides and actinides.
		The Periodic Table of the Elements is a way to arrange the elements to show a large amount of information and organization.
		The Lanthanides belong to Period 6, and the Actinides belong to Period 7.
	gpc.edu /~pgore/PhysicalScience/Periodic-table.html (1468 words)

	Periodic Tables (Site not responding. Last check: 2007-11-06)
		The Periodic Table of the Elements Groton HS Periodic Table (Hardcorp)
		Periodic Table of the Elements University of Colorado
		Periodic Table The Periodic Table By: Levi, Primo
	www.chemistrycoach.com /periodic_tables.htm (1659 words)

	Kids.Net.Au - Encyclopedia > Periodic table
		The periodic table of the chemical elements is a display of the known chemical elements, arranged by electron structure so that many chemical properties vary regularly across the table.
		The number of electron shells an atom has determines what period it belongs to.
		Despite their dramatic differences in mass within the group, their allotropes have very similar properties: They are all highly corrosive (meaning they combine readily with metals to form metal halide[?] salts); chlorine and fluorine are gases, while bromine is a very low-boiling liquid; chlorine and bromine at least are highly colored.
	www.kids.net.au /encyclopedia-wiki/pe/Periodic_table (541 words)

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