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1. pubchem.ncbi.nlm.nih.govPubChem

   pubchem.ncbi.nlm.nih.gov

   Search and explore chemical information in the world's largest free chemistry database. Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and physical properties, biological activities, safety and toxicity information, patents, literature citations and more.

   • NIH National Library of Medicine NCBI

     NCBI is a hub for biotechnology information, offering...

   • Docs

     The question is not surprising as the names “substance” and...

   • Submit

     PubChem Upload tool enables users to submit data to the...

   • Browse Data

     The sections, along with their child subsections, that are...

   • Periodic Table

     Interactive periodic table with up-to-date element property...

   • Explore Data Sources

     Browse PubChem data sources by country, type of data...

2. pubchem.ncbi.nlm.nih.gov › periodic-tablePeriodic Table of Elements - PubChem

   pubchem.ncbi.nlm.nih.gov › periodic-table

   Interactive periodic table with up-to-date element property data collected from authoritative sources. Look up chemical element names, symbols, atomic masses and other properties, visualize trends, or even test your elements knowledge by playing a periodic table game!

3. www.chemspider.comChemSpider: Search and Share Chemistry - Homepage

   www.chemspider.com

   • Zapisane w pamięci cache

   A free chemical structure database providing fast text and structure search access to over 130 million structures from hundreds of data sources.

4. ptable.comPeriodic Table - Ptable

   ptable.com

   • Zapisane w pamięci cache

   Interactive periodic table showing names, electrons, and oxidation states. Visualize trends, 3D orbitals, isotopes, and mix compounds. Fully descriptive writeups.

5. www.britannica.com › topic › Interactive-Periodic-Table-of-the-ElementsInteractive Periodic Table of the Elements | Symbols, Atomic...

   www.britannica.com › topic › Interactive-Periodic-Table-of-the-Elements

   • Zapisane w pamięci cache

   Moreover, new specialities continue to appear, as, for example, pesticide, forensic, and computer chemistry. This is an interactive periodic table of the elements showing their atomic weights, atomic numbers, electron configurations, and state at room temperature.

6. www.chemexper.comChemExper

   www.chemexper.com

   • Zapisane w pamięci cache

   The ChemExper Chemical Directory is a free service that allows to find a chemical by its molecular formula, IUPAC name, common name, CAS number, catalog number, substructure or physical characteristics as well as chemical suppliers.

7. commonchemistry.cas.orgCAS Common Chemistry

   commonchemistry.cas.org

   • Zapisane w pamięci cache

   Quickly confirm chemical names, CAS Registry Numbers®, structures or basic physical properties by searching compounds of general interest or leveraging an API connection.