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interactive periodic table created especially for K-12 students.
http://www.chemicalelements.com/
provides detailed properties for each element.
http://www.chemicool.com/
offers general elements information, data, nuclides, molecular mass calculator, and a printable version with custom properties.
http://ptoe.move.to/
displays basic properties.
http://www.periodic-table.com/
provides detailed information on each element in the periodic table.
http://www.webelements.com/