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Topic: Periodic table of the chemical elements

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	NationMaster - Encyclopedia: Periodic table
		The periodic table of the chemical elements A chemical element, or element, is a type of atom that is defined by its atomic number; that is, by the number of protons in its nucleus.
		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).
		Periodic Table, table of the chemical elements arranged to illustrate patterns of recurring chemical and physical properties.
	www.nationmaster.com /encyclopedia/periodic-table (745 words)

	Periodic Table - MSN Encarta
		Elements, such as oxygen, iron, and gold, are the most basic chemical substances and cannot be broken down by chemical reactions.
		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.
		Elements with similar properties are placed in the same group of the periodic table, but for many years it was a mystery why these elements behaved similarly.
	encarta.msn.com /encyclopedia_761586387/Periodic_Table.html (1174 words)

	NationMaster - Encyclopedia: Cosmochemical Periodic Table of the Elements in the Solar System
		Chemists were able to quantitatively explain the behavior of the elements, and to predict the existence of printable periodic table of elements yet undiscovered ones.
		Progressing through a group from lightest element to heaviest element, the outer-shell electrons (those most readily accessible for participation in chemical reactions) are all in the same type of orbital, with periodic table a similar shape, but with increasingly higher energy and average distance from the nucleus.
		periodic table of element Mendeleev was later vindicated by the discovery of the electronic structure of the elements in the late 19th and early 20th century.
	www.nationmaster.com /encyclopedia/Cosmochemical-Periodic-Table-of-the-Elements-in-the-Solar-System (515 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 original table was created without a knowledge of the inner structure of atoms: if one orders the elements by atomic mass, and then plots certain other properties against atomic mass, one sees an undulation or periodicity to these properties as a function of atomic mass.
		Elements adjacent to one another within a group have similar physical properties, despite their significant differences in mass.
	www.kids.net.au /encyclopedia-wiki/pe/Periodic_table (541 words)

	C&EN: IT'S ELEMENTAL: THE PERIODIC TABLE - INTRODUCTION
		To chemists, however, the periodic table reveals the organizing principles of matter, which is to say, the organizing principles of chemistry.
		New elements were discovered that filled in the holes Mendeleyev left in his table, and their atomic weights and chemical properties corresponded with remarkable accuracy to Mendeleyev’s predictions.
		The periodic table is so central to chemistry that it seemed natural to devote a special issue to it and the elements that compose it as we celebrate CandEN’s 80th anniversary.
	pubs.acs.org /cen/80th/elements.html (487 words)

	Education Resources » Periodic table
		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.
		The main value of the periodic table is the ability to predict the chemical properties of an element based on its position in the table.
		A period is a horizontal row in the periodic table of the elements.
	www.thecatalyst.org /resource/2006/04/21/Periodic-table (1991 words)

	Periodic Tables (Site not responding. Last check: )
		The Periodic Table of the Elements (Morgan, UVm)
		Periodic Table of the Elements University of Colorado
		Periodic Table of the Elements Covalent Radius MIT
	www.chemistrycoach.com /periodic_tables.htm (1659 words)

	PeriodicTable
		Elements are arranged by atomic number (number of electrons or protons); hydrogen 1, helium 2.
		In general the elements on the left side of the table will naturally combine through electrical charges to the elements on the right side of the table to form familiar compounds; two hydrogens (H) with oxygen to form water; Sodium (Na) with chlorine (Cl) to form salt.
		Carbon (C) is the one element that is capable of tying the other elements in the form of molecules together in long complex forms to create life.
	www.homestead.com /indianamufon/PeriodicTable.html (366 words)

	New Insights Into The Periodic Table of Chemical Elements (Site not responding. Last check: )
		Today, the periodic table has 116 elements, the most recent of which was added just last month - an element that for now is known as element 118 for the number of protons in its nucleus, more than in any other element.
		Most of the credit for the periodic table has gone to a distinguished Russian scientist named Dimitri Ivanovich Mendelev, who was the last of the six scientists to present a periodic table in the 1860s.
		On the day he devised the periodic system, he was supposed to inspect a cheese factory, Scerri said, and decided not to go; Mendelev sketched his first periodic table on the back of an invitation that day, Feb. 17, 1869.
	www.azom.com /details.asp?newsID=7214 (1211 words)

	About Periodic Tables page at PeriodicTable.com (Site not responding. Last check: )
		of the chemical elements is an incredibly useful icon of chemistry, arrived at by a series of developments and observations by experimental scientists, crystallizing in the mid-1800s.
		The "fearful symmetry" was evolved, as he said, "independently of any conception as to the nature of the elements." Recent knowledge gained of the structure of atoms has gone far towards explaining the shape of the periodic table, and songs of praise have been sung to it's beauty and power.
		A number of problems with equating the periodic table with the periodic law have been resolved by the recognition that relationships between elements are more clearly and accurately shown in three-dimensional representations.
	www.periodictable.com /pages/AAE_PerTbl.html (208 words)

	The Periodic Table
		The lanthanide elements (row 6) and the actinide elements (row 7) are in most cases separated from the rest of the table by being placed beneath the table.
		Elements increase in their atomic masses as you move down rows of the table, but they change in their chemical properties.
		The periodic table is divided into three main sections: the metals, the nonmetals, and the metalloids.
	www.chem.lsu.edu /lucid/tutorials/Periodic_Table.html (531 words)

	Periodic table - Pharmpedia
		Mendeleev's discovery of the periodic table was one of the greatest developments in modern chemistry; chemists for the first time were able to quantitatively explain the behaviour of the elements and to predict the existence of undiscovered ones.
		There are 116 chemical elements whose discovery has been confirmed; 94 can be found naturally on Earth, and the rest have been produced in laboratories.
		John Alexander Reina Newlands, who in 1865 noticed that the elements of similar type recurred at intervals of eight, which he likened to the octaves of music, though his law of octaves was ridiculed by his contemporaries.
	www.pharmpedia.com /Periodic_table (1355 words)

	Chemistry: WebElements Periodic Table
		The element polonium is very much in the news at present, perhaps for the first time ever, and for the wrong reasons.
		The groups (columns in the periodic table) are numbered 1-18.
		There are many different ways, sometimes ingenious, of arranging the chemical elements according to which properties are of particular interest but that shown here is a standard form of the periodic table.
	www.webelements.com (426 words)

	The Chemical Elements
		As the elements were also arranged in families (columns) this enabled him to predict the properties of the undiscovered elements with great accuracy (like Sodium and Potassium referred to earlier) This major theoretical breakthrough provided the necessary classification system by which the properties of all the atomic elements could be mapped out.
		Heavier elements were made later, by nuclear reactions in the core of stars - the heaviest reactions being formed inside exploding stars.
		The average age of elements in the spiral arms of the galaxy, where element making has continued during the past 4,550 million years, is around 9,000 million years.
	www.kheper.net /cosmos/chemical_elements/chemical_elements.htm (467 words)

	Periodic Table of Chemical Elements - Numericana
		For brevity, the configuration of a noble gas may be denoted by its bracketed symbol [as a prefix] in the electronic configuration of subsequent elements.
		Chemical inertness is due to an outter shell containing a total of 8 electrons (except for helium).
		In the periodic table, successive "transition metals" correspond to the "filling" of a "d" subshell (from 1 to 10 electrons).
	home.att.net /~numericana/data/elements.htm (598 words)

	The Element Aluminum -- Aluminum Atom
		The periodic table of the chemical elements is a tabular display of the known chemical elements.
		Mendeleev was later vindicated by the discovery of the electronic structure of the elements in the late
		Periodic Tables (http://www.chemistrycoach.com/periodic_tables.htm) (in case you were thinking that the Internet needed one more)".
	www.worldofmolecules.com /elements/Periodic_table.htm (679 words)

	Periodic table
		The modern periodic table is a table showing known elements, their symbols, atomic numbers and relative atomic masses.
		He also discovered that if he put the elements of a triad in order of RAM, the RAM of the element in the middle was very close to the average RAM of the other two elements.
		The major fault in Mendeleev’s table was that he believed that it was the mass of the elements that affected their properties.
	library.thinkquest.org /27917/content/chp3/periodic_table.htm (641 words)

	ipedia.com: Periodic table Article (Site not responding. Last check: )
		The elements are arranged by electron structure so that many chemical properties vary regularly across the table.
		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)

	LESSON PLANS: 58 Periodic Table Lessons reviewed by Teachers
		Periodic Table - Students identify and label each of the elements in the periodic table with their names, atomic number and atomic masses, by playing a game of Jeopardy.
		Periodic Table Lesson Plan: Chemical Elements - Students identify, name, and interpret chemical elements on the table by creating a WANTED poster for an assigned element and presenting the poster to the class.
		Elements, Atoms and the Periodic Table - Students examine common atoms, the periodic table, and atomic structure.
	www.lessonplanet.com /search/Science/Chemistry/Periodic_Table (401 words)

	Periodic Table of Chemical Elements - Chemistry Online Education
		The periodic table of the chemical elements is a table that displays all known chemical elements in a systematic way.
		The elements in the periodic table are ordered by their atomic number (Z) and are arranged in periods (horizontal rows) and groups (vertical columns).
		The layout of the periodic table is designed to illustrate periodic trends, similarities and differences in the properties of the elements.
	www.webqc.org /periodictable.php (146 words)

	Chemistry: Periodic Table and More
		Periodic Table first discovered in 1869 by Dmitry I. Mendeleyev is a way of presenting all the elements so as to show their similarities and differences.
		Elements 58 to 71 are known as lanthanide or rare earth elements.
		Elements 90 to 103 are known as the actinide elements.
	www.chemicool.com (229 words)

	Printable Periodic Table of Elements Dmitry Mendeleyev
		The periodical tables first discovered in 1869 by Dmitry I Mendeleyev who was a Russian Chemist: The chemical element is the fundamental material of which all matter is composed.
		The Periodic table of elements is a way of presenting all the elements so as to show their similarities and their differences.
		The periodic table of elements are arranged in increasing order of atomic number (z) as you go from left to right across the periodic table.
	www.dovada.com /periodic_table.htm (602 words)

	Periodic Table Lesson Plan: Chemical Elements, Teaching Elementary Chemistry Science Activity
		After reading about the periodic table, students will be able to identify, name, and interpret chemical elements on the table by creating a WANTED poster for an assigned element and presenting the poster to the class.
		Once students are in groups, pass out one Chemical Elements Graphic Organizer and one photocopy of the periodic table to each group.
		Students can choose an element out of a hat, play pin the tail on the element, or just be assigned an element to do their project on.
	www.instructorweb.com /lesson/elements.asp (629 words)

	Mendeleev's Periodic Table Of The Chemical Elements
		Mendeleev's famous table suffers from the minor inconvenience of having to insert the lanthanides and actinides as rows
		Quite what happens after element 120 is yet to be discovered, though doubtless one could do the theoretical (or computational) analysis to discover what electron orbitals arise, which would answer the question.
		Summing 2.b+1 over b in n yields n.n, so each cycle of the table should be twice a perfect square; sure enough, we have cycles of lengths 2, 8, 18 and 32, twice the squares of 1, 2, 3 and 4.
	www.chaos.org.uk /~eddy/bits/elements.html (2630 words)

	Mendeleev's periodic table \| WebElements Chemistry Nexus
		This table shows the form of Mendeleev's Periodic Table of the chemical elements as published in 1872.
		O and RH, etc., are written in the style of the time which uses superscripts to denote the number of atoms in molecules rather than the current style which uses subscripts.
		He was able to predict with considerable success the properties of some of the missing chemical elements such as germanium.
	www.webelements.com /nexus/Mendeleev_Periodic_Table (258 words)

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