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The Open Directory (TOD)

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• Science: Chemistry: Directories  (16)
• Science: Reference  (433)

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	Dutch  (4)   German  (13)   Japanese  (6)   Spanish  (15)   Swedish  (4)

• Periodic Table of the Elements   - Available in many languages. Interactive periodic table that includes information on compounds, appearances and nuclear, physical and electronic properties. Needs Flash.

• ChemicalElements.com: Online Periodic Table - [Basic data, limited write-ups] Provides information on the 109 named elements plus elements 110 - 112.
• Chemicool Periodic Table - [Detailed information on each element, no write-ups]
• Chemistry / Periodic table Quiz - Millionaire type periodic table quiz. Has a link to other science quizzes.
• 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.
• Dynamic Periodic Table - Interactive periodic table with dynamic layouts showing names, electrons, sliders, trend visualization, and instant search. Includes full descriptions, PDFs, and PNG.
• 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.
• 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.
• Elements of life - Educational/promotional flash presentation highlighting the roles of several chemical elements in a diverse range of end products.
• Elementymology and Elements Multidictionary - Explains the origins of the names of the chemical elements and lists element names in scores of languages.
• Engineers Edge - [Basic] Simple periodic table of elements.
• 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.
• The Extended Periodic Table Of The Elements - [No elemental data] Alternate versions of the extended periodic table. Include information on symmetry and electronic configurations.
• Gordon England's Periodic Table of the Elements - [Detailed data]
• InfoFries - PDF Periodic Tables - Provides various printable periodic tables in PDF format - from the simplest to the very detailed.
• Infoplease.com: Periodic Table - An interactive periodic table with information about each element including the symbol, boiling point, melting point, discoverer and origin.
• 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.
• Lenntech Periodic table - Interactive periodic table. Containing physical data, chemical properties and health and environmental effects. Available 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.
• 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.
• 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.
• The Periodic Table - A printable periodic table. PDF format. [PDF]
• The Periodic Table - Features an interactive table based on the IOUPAC 1985 standard.
• The Periodic Table - Provides information about Dimitri Mendeleev's Periodic table of elements and their Atomic Numbers.
• Periodic Table ADventure - [No data] Includes the history of the periodic table and information on the structure of atoms and the periodic table.
• 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.
• Periodic Table of Data - [Basic data] Interactive periodic table. Including uses and discovery.
• 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.
• 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.
• Periodic Table of the Elements - [Very Comprehensive data] Interactive periodic table. Includes additional information on ionisation energies, abundance, isotopes and reduction potentials.
• Periodic Table of the Elements - [Basic data]Interactive periodic table of the elements
• Periodic Table of the Elements - [Very basic data] Includes oxidation states and electronegativity.
• Periodic Table of the Elements - [Basic data] Interactive periodic table.
• Periodic Table of the Elements - [Basic data] Simple click on periodic table. Includes electrical conductivity and ionization energies.
• 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 - ChemGlobe - [Detailed data, includes write-ups, basic nuclide data, printable version] Chemical elements database from ChemGlobe.
• 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.
• 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.
• Printable Periodic Table - [Very basic data] Minimalist table that provides symbols, atomic numbers, and atomic weight with four significant figures.
• 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 - Two up-to-date periodic tables in PDF format.
• 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.
• Science: Periodic Table from tcaep.co.uk - [Detailed data] Interactive periodic table. Includes electronegativity, density, conductivity and molar volumes.
• 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.
• Table of Periodic Properties of the Elements - [Detailed data] Shows two alternate versions of the periodic table. Element data is found under group sections. Includes radii, conductivity, enthalpy changes and oxidation state.
• 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.
• 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.
• 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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