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  1. nih.gov
    https://pubchem.ncbi.nlm.nih.gov

    PubChem

    PubChem is the world's largest collection of freely accessible chemical information. Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and …

  2. nih.gov
    https://pubchem.ncbi.nlm.nih.gov › periodic-table

    Periodic Table of Elements - PubChem

    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, …

  3. nih.gov
    https://pubchem.ncbi.nlm.nih.gov › periodic-table › atomic-mass

    Atomic Mass | Periodic Table of Elements - PubChem

    Relative atomic mass is the ratio of the average mass of the atom to the unified atomic mass unit (symbol: u) or dalton (symbol: Da), which is defined as one twelfth of the mass of a carbon-12 …

  4. nih.gov
    https://pubchem.ncbi.nlm.nih.gov › element › Mercury

    Mercury | Hg (Element) - PubChem

    Chemical element, Mercury, information from authoritative sources. Look up properties, history, uses, and more.

  5. nih.gov
    https://pubchem.ncbi.nlm.nih.gov › periodic-table › pdf › Periodic_Table...
    [PDF]

    PERIODIC TABLE OF ELEMENTS - PubChem

    PERIODIC TABLE OF ELEMENTS Chemical Group Block 17 Atomic Number Cl Symbol Chlorine Name Halogen Chemical Group Block 1 H Hydrogen Nonmetal 1 1 2 He Helium Noble Gas

  6. nih.gov
    https://pubchem.ncbi.nlm.nih.gov › compound › Capsaicin

    Capsaicin | C18H27NO3 | CID 1548943 - PubChem

    Capsaicin | C18H27NO3 | CID 1548943 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety ...

  7. nih.gov
    https://pubchem.ncbi.nlm.nih.gov › periodic-table › density

    Density | Periodic Table of Elements - PubChem

    Explore how density changes with atomic number in the periodic table of elements via interactive plots.

  8. nih.gov
    https://pubchem.ncbi.nlm.nih.gov › compound › ammonia

    Ammonia | NH3 | CID 222 - PubChem

    Ammonia | NH3 or H3N | CID 222 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety ...

  9. nih.gov
    https://pubchem.ncbi.nlm.nih.gov › search › help_search.html

    The PubChem Compound Help

    To search the PubChem Compound Database using a textual query (and not by a chemical structure query), please click the Name/Text tab to go to the appropriate query form: A …

  10. nih.gov
    https://pubchem.ncbi.nlm.nih.gov › element › Ar

    Argon | Ar (Element) - PubChem

    The name derives from the Greek argos for "lazy" or "inactive" because it does not combine with other elements. It was discovered in 1894 by the Scottish chemist William Ramsay and the …

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