参考工具    
General Reference

• 109 - Visual Elements- Visit the new visual interpretation of the table of elements at chemsoc, the chemistry societies network
• A Brief History of the Development of the Periodic Table- Western Oregon University
• Chemicool Periodic Table- Oxidation and electrons, reactions, conductivity, and radius information; by David D. Hsu
• Hyper Chemistry on the Web! – The Periodic Table- Description of the elements' physical, structural, and chemical properties; 1996 Thinkquest Entry
• Magnetic Resonance Periodic Table- Receive magnetic resonance information for an element
• A Periodic Table of the Elements at Los Alamos National Laboratory-Elemental properties, uses, sources, and handling; by the Los Alamos National Laboratory
• WebElements- Mark Winter's (University of Sheffields) award winning site; elemental background, descriptions, and physical properties
• X-Ray Properties of the Periodic Table- Choose an element and receive its x-ray properties

Tools

• Acid Constants- Web-based table of acid constants produced by Franklin and Marshall´s chemistry department.
• Amino Acids- Name, formulas, and descriptions of the amino acids
• Astro-Physical Calculator- A calculator with physical and astronomical constants and functions
• Chemistry Functions- Perform various calculations and conversions related to chemistry
• Chemistry WebBook- Provides thermochemical, thermophysical, and ion energetics data compiled by NIST under the Standard Reference Data Program
• The Constants and Equations Pages- Constants and equations with explanations and the meaning of the symbols used
• Conversion of Units- Conversion calculator by the Freie Universität Berlin (English and German versions)
• EMBL Protein & Peptide Group- Protein database searching by mass spectrometric data
• Engineering Conversion – Tables – Calculators- Conversions especially for engineers
• Entisoft Units - Measurement Conversion Calculator - Download calculator to convert units
• Fundamental Physical Constants from NIST- Provides values for constants and their uncertainties
• IFP – Metric Conversion Tables- Conversions from and to metric, imperial, and U.S. measurement systems
• Mass Spec Peptide Fragment Ion Calculator at UCSF
• Molecular Weight Calculator - Enter a chemical compound to determine its molecular weight
• Protein Data Bank- An archive of experimentally determined three-dimensional structures of biological macromolecules
• TheRate- Determine rate constants from electronic structure molecular orbitals and density functional theory
• Unit Conversion Tables- Lists tables to determine conversion between units

History

• Atomic Structure Timeline- History of the different models of atomic structure.
• The History of Chemistry- by the 1992 Woodrow Wilson Summer Institute
• The Official Website of the Nobel Foundation - Names and biographies of the Nobel Prize winners