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  1. 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, …

  2. 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 …

  3. 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

  4. nih.gov
    https://pubchem.ncbi.nlm.nih.gov › ghs

    GHS Classification Summary - PubChem

    Note: This page provides the current GHS summary. Obsolete [(marked as) deleted in GHS Rev.10 2023 PDF document] H-codes and P-codes are also provided, as they are still in use …

  5. 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 …

  6. nih.gov
    https://pubchem.ncbi.nlm.nih.gov › docs › elements

    Elements - PubChem

    PubChem has summary pages specific to chemical elements, and a periodic table.

  7. nih.gov
    https://pubchem.ncbi.nlm.nih.gov › compound › naphthalene

    Naphthalene | C10H8 | CID 931 - PubChem

    Jan 14, 2016 · Naphthalene | C10H8 | CID 931 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety ...

  8. 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.

  9. nih.gov
    https://pubchem.ncbi.nlm.nih.gov › periodic-table › atomic-radius

    Atomic Radius | Periodic Table of Elements - PubChem

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

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

    Tin | Sn (Element) - PubChem

    The element has two allotropic forms at normal pressure. On warming, gray, or alpha tin, with a cubic structure, changes at 13.2°C into white, or beta tin, the ordinary form of the metal.

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