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. Mendeleev intended the table to illustrate recurring ("periodic") trends in the properties of the elements. The layout of the table has been refined and extended over time, as many new elements have been discovered since Mendeleev's time, and new theoretical models have been developed to explain chemical behavior. Various different layouts are possible to emphasize different aspects of behavior; the most common forms, however, are still quite similar to Mendeleev's original design.
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 behavior. The table has also found wide application in physics, biology, engineering, and industry. The current standard table contains 116 confirmed elements, and two further speculated elements.
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Directories :: Chemistry
Reference :: Science

Periodic Table of the Elements - [Very comprehensive data] Available in many languages. Interactive periodic table that includes information on compounds, appearances and nuclear, physical and electronic properties. Needs Flash.
A Periodic Table of the Elements at Los Alamos National Laboratory - [Very basic data, detailed write-ups] The Chemical Science and Technology division's Periodic Table describes the history, properties, resources, uses, isotopes, forms, costs, and other information for each element.
ChemicalElements.com: Online Periodic Table - [Basic data, limited write-ups] Provides information on the 109 named elements plus elements 110 - 112.
Meta Description: [ An up-to-date periodic table with detailed but easy to understand information ]
Chemicool Periodic Table - [Detailed information on each element, no write-ups]
Meta Description: [ Chemicool Chemistry Periodic table (periodic chart) of the elements. Information about hydrogen, oxygen, silver, carbon, aluminium...plus Forum, Dictionary and Tools. ]
Chemistry / Periodic table Quiz - Millionaire type periodic table quiz. Has a link to other science quizzes.
Meta Description: [ A 15 question Science quiz. Based on Millionaire, so questions go from easy to hard. ]
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Chemistry.org Periodic Table from the American Chemistry Society - [Comprehensive] Interactive periodic table which includes enthalpy of fusion, vaporisation and molar heat capacity. Diagrams of electronic configurations and data graphs.
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. Also has interesting facts about each element represented.
DreamWave Periodic Table of the Elements - An interactive javascripted periodic table, which contains basic element properties.
Meta Description: [ An info-packed interactive javascripted Periodic
Table. Designed by DreamWave: the premiere e-source for dream reverie and
revelation. (Mendeleyev first saw the table in a dream). ]
eFunda: Periodic Table - [Basic data] Interactive periodic table. Includes electrical resistivity, vaporization enthalpy and heat capacity.
Elemental - Is it time to revamp the periodic table? - Article by Jon Lackman, on Slate magazine, about an alternative periodic table, shaped as a galaxy, designed by Oxford ecologist Philip Stewart. Includes a slide show and pictures.
Meta Description: [ Click here to see a slide show. Oxford ecologist Philip Stewart has designed a new periodic table of the elements, and it's a hit. American schools are placing orders daily for Stewart's table, and the Royal Society of Chemists recently sent a copy to ever ]
Elementymology and Elements Multidictionary - Explains the origins of the names of the chemical elements and lists element names in scores of languages.
Meta Description: [ Origin of the names of the chemical elements and multilingual dictionary of element names (72 languages); Periodic table and how the elements got their names; Process of naming the elements on the periodic table ]
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Engineers Edge - [Basic] Simple periodic table of elements.
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EnvironmentalChemistry.com: Periodic Table of Elements - [Very comprehensive data, write-ups, extensive listing of nuclides] Data on elements includes scores of properties, element names in a dozen languages and almost all known nuclides. Environmental chemistry articles round out site.
Exploring the Table of Isotopes - [Nuclide data only, extensive listing of nuclides] Provides isotope data for almost all known nuclides. From Berkeley Laboratory.
Extended Periodic Table - [Very basic data] Predicted periodic table for undiscovered elements with atomic number greater than 118. Theoretical discussion and Orbital freeware available.
Meta Description: [ Extended Periodic Table, Compression of inner-orbitals/ shells, Inert-gas algorithm (rare-gas),Antimatter, algorythm, atomic weight, Sites donnant le tableau des éléments chimiques. Tous les éléments détaillés y compris table périodiques étendues (N < 226) ]
Fast Periodic Table - [Basic data] Interactive periodic table. Including uses and discovery.
Meta Description: [ An interactive Periodic Table with loads of data aimed at school children and others ]
Gordon England's Periodic Table of the Elements - [Detailed data]
Meta Description: [ Periodic chart of the elements or periodic table of elements, giving links to data on each element. ]
Infoplease.com: Periodic Table - An interactive periodic table with information about each element including the symbol, boiling point, melting point, discoverer and origin.
Meta Description: [ Up-to-date, interactive, and detailed information on every chemical element. Infoplease's Periodic Table shows the atomic weight, melting and boiling points, density, appearance, and additional properties for each element. ]
Interactive Periodic Table - [Basic] An interactive period chart of the elements.
Interactive Periodic Table - Easily visualize relative differences between elements by dynamically coloring table (and generating graphs) based on elements attributes.
It's Elemental - The Periodic Table of Elements - [Detailed data] Interactive periodic table. Including melting point, density, element history and crustal and oceanic abundance.
Meta Description: [ Have some fun with the table of elements! ]
Large color text-only printable periodic table - [Basic data] All data including electron configuration on one page, available as PDF, PNG, and HTML.
Meta Description: [ Large printable periodic table of elements with names for homework. Click an element for a full description. Includes PDF and image. Latest new elements. ]
Lenntech Periodic table - Interactive periodic table. Containing physical data, chemical properties and health and environmental effects. Available in five languages.
Meta Description: [ The interactive periodic table of elements - chemical data, health and environmental effects presented in five languages ]
Model Periodic Table - Model Science Software - [Basic data] Interactive periodic table by Model Science Software. Available in English and Spanish, web based, Windows and Mac versions. Includes customizable quiz features.
NIST Ground Levels and Ionization Energies for the Neutral Atoms - [Basic] Periodic table includes ground-state electron configuration, ground-state level, ionization energy, state and frequently used fundamental physical constants.
Meta Description: [ ground state electron configurations and
ionization energies for the neutral atoms (Z=1-104) including references ]
On-line The Periodic Table of Elements - [Basic data, requires JavaScript] Includes historical information about the elements in Italian, but the table itself is in English.
Meta Description: [ periodic table of elements, name, Atomic number, Atomic weight, Boiling point and melt, Oxidation numbers, Electronegativity, Redox, Electronic structure, Density... ]
Periodic Table - [Detailed data] American Chemical Society's periodic table with visual electronic configurations and interactive plots of physical and chemical properties. Requires Flash.
Periodic table - Printable Interactive periodic table of the elements, chemistry data tables and pictures of elements.
Periodic Table - An interactive clickable periodic table of the elements, which contains basic element properties and descriptions.
Meta Description: [ the-periodic-table.org; periodic table, periodic table of elements, periodic table of the elements table,
chemistry,elements,periodic table,science. A free resource for scientists, students and researchers to
help broaden the knowledge of chemistry and the periodic table. ]
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 of Elements - [Basic data] Chemistrydata.com offers very basic information about elements in a searchable format. Includes a printable periodic table.
Periodic Table of Elements - [Detailed] Includes general information about an element, atomic number and weight, shells and filling orbital, melting and boiling point, covalent and atomic radius, and lots of other parameters.
Periodic Table of Parameters - [Basic] This table lists and describes some well documented and validated parameter sets available for modeling each element by Molecular Mechanics and Quantum Mechanics molecular modeling methods.
Meta Description: [ Periodic table, showing which Computational Chemistry methods have parameters available for modeling each element. ]
Periodic Table of the Elements - [Basic data, includes printable version] Information on each of the chemical elements and data on their properties. Some site information is only in Czech language.
Meta Description: [ Interactive chemistry Periodic table. Detailed information about hydrogen, oxygen, gold, silver, carbon, iron, lead, copper, aluminium and other chemical elements. Forum or discussion board (group) for every element. ]
Periodic Table of the Elements - [Very Comprehensive data] Interactive periodic table. Includes additional information on ionisation energies, abundance, isotopes and reduction potentials.
Meta Description: [ New address! - www.periodni.com/en/ - Please update your Bookmarks. Periodic Table of the Elements is a very attractive periodic table, available in six languages (German, English, French, Croatian, Italian and Spanish). ]
Periodic Table of the Elements - [Very basic data] Includes oxidation states and electronegativity.
Periodic Table of the Elements - [Basic data]Interactive periodic table of the elements
Meta Description: [ This is an interactive periodic table or periodic chart of the chemical elements. ]
Periodic Table of the Elements - [Basic data] Interactive element data. Geared towards refractory materials which are covered in great detail.
Periodic Table of the Elements - [Basic data] Interactive periodic table.
Meta Description: [ The entire Periodic Table of the Elements, up to Lawrencium (element 103) with descriptive information and properties for each. ]
Periodic Table of the Elements - [Basic data] Simple click on periodic table. Includes electrical conductivity and ionization energies.
Periodic Table of the Elements - ChemGlobe - [Detailed data, includes write-ups, basic nuclide data, printable version] Chemical elements database from ChemGlobe.
Meta Description: [ Periodic table of chemical elements, chemical elements database from ChemGlobe. ]
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Periodic Table of the Elements with Calculators - Features a molecular mass calculator. Data includes spectroscopic terms and Xcore. [Requires JavaScript]
Printable Periodic Table - [Very basic data, requires Adobe Acrobat Reader] PDF of the Periodic Table arranged in different formats. Files only contain elements' symbols, names and atomic number.
Printable Periodic Table - [Very basic data] Minimalist table that provides symbols, atomic numbers, and atomic weight with four significant figures.
Meta Description: [ This is a simple, printable periodic table accurate to four digits. ]
Printable periodic table - Two up-to-date periodic tables in PDF format.
Meta Description: [ Up-to-date Mokeur's printable periodic table of the elements, black and color, 2006 ]
Proton Don - Funbrain Periodic Table Game - A fun way for youngsters to learn the periodic table. Includes learning by symbol or by name.
PTE Periodic Table of the Elements - [Very basic data, includes writeups, Requires Javascript]
Quiz Hub: Element Symbol Quiz - [Basic data] Quiz that involves remembering symbols. Includes copy of periodic table with data.
Meta Description: [ Screenshot of a periodic table of the elements game. ]
Science-Park's Periodic Table of the Elements - [Detailed data] Interactive periodic table including boiling and melting point, discovery, thermal conductivity and density. Nice section where you can put the elements in order of their conductivity, melting point and other properties.
Meta Description: [ Online information reference to the periodic table of the elements, complete description of history of discovery, physical properties, extraction methods and data on natural abundance, thermal conductivity and so on. ]
Science: Periodic Table from tcaep.co.uk - [Detailed data] Interactive periodic table. Includes electronegativity, density, conductivity and molar volumes.
Meta Description: [ Over 600 alphabetically listed Constants, aspects of maths, some 450 equations,Additions & Multiplication tables, Interactive conversions and details on all the standard SI units identities, including complex numbers of measurement, Greek alphabet, electronic symbols and mathematical symbols ]
Table of the Nuclides - [Nuclide data only, very extensive listing of nuclides] Map of all known nuclides, with their atomic mass, radioactive decay modes and half-lives, and related information. Brookhaven National Laboratory.
The 'Periodic Table' Table - [Basic data] Based on a wooden 'periodic table' table. Contains photographs of over 200 element samples, with descriptions, experiments, and stories about many of them. Winner of the 2002 Ig Nobel prize in Chemistry.
Meta Description: [ The Wooden Periodic Table Table by Theodore Gray ]
The Atomflowers of the Periodic Table. - [Basic data] Atomflowers growth when atoms are build up with their s, p, d and f orbitals according to the rules of the Periodic Table.
Meta Description: [ flowers and gifts send flower online same day delivery teleflora ]
The Elements and Isotopes - The Elements and Isotopes is a comprehensive application that will display information from the Periodic Table and the Table of the Isotopes.
Meta Description: [ The Elements and Isotopes has been developed as a comprehensive application to display information from the Periodic Table and the Table of the Isotopes ]
The Extended Periodic Table Of The Elements - [No elemental data] Alternate versions of the extended periodic table. Include information on symmetry and electronic configurations.
The Periodic Table - A printable periodic table. PDF format.
The Periodic Table - Provides information about Dimitri Mendeleev's Periodic table of elements and their Atomic Numbers.
Meta Description: [ A Comprehensive resource and guide for students on the Standard Peroiodic Table of elements and their Atomic numbers based on the origonal Periodic Table created by Dimitri Mendeleev in 1869 ]
The Periodic Table - Features an interactive table based on the IOUPAC 1985 standard.
Meta Description: [ Visit this site to learn about chemical elements and use the Periodic Table. Instant information using the Periodic Table. A Comprehensive educational resource and guide for students on the Standard Peroiodic Table of elements and their Atomic numbers based on the origonal Periodic Table created ... ]
The Periodic Table Challenge - [No element data] An auto-scored blank periodic table. The user fills it in online and the score is returned automatically.
Meta Description: [ The Periodic Table challenge is an auto-scored blank periodic table that you fill in on-line. Your score is automatically returned by our web server. ]
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The Periodic Table of Element - [Basic data] Interactive periodic table including data on element uses and their discovery. Shows element composition of 16 minerals, including quartz and calcite.
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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.
Visual Elements - [Detailed data, write-ups, basic listing of nuclides] The Royal Society of Chemistry's (in the UK) contribution to chemistry on the web.
VRML Periodic Table - [Very basic date, requires VRML] Visual representations of the Bohr model of the atom in 3D.
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WebElements - [Very comprehensive, includes very detailed write ups, basic nuclide data, extensive graphics] Professional scientists and students at school will all find something useful. Includes thousands of images relating to periodicity and structure.
Meta Description: [ This is the home page of WebElements, chemistry's periodic table (periodic chart) of the elements on the World-Wide Web. Find information about elements such as hydrogen, copper, gold, and uranium here. ]
X-Ray Properties of the Elements - [X-ray properties only] X-ray properties of most of the elements.
YOGI's Periodic Table of the Elements - [Basic data] Information includes nuclides.Interactive periodic table.
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