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1. pubchem.ncbi.nlm.nih.govPubChem

   pubchem.ncbi.nlm.nih.gov

   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 physical properties, biological activities, safety and toxicity information, patents, literature citations and more.

   • Pubchem Search

     PubChem is the world's largest collection of freely...

   • Periodic Table

     Chemical Element Data in PubChem. PubChem is providing this...

   • NIH National Library of Medicine NCBI

     The .gov means it's official. Federal government websites...

   • PubChem

     Learn about PubChem chemical database, browse or search the...

   • Docs

     In PubChem terminology, a substance is a chemical sample...

   • Nitric Acid

     The nitrate ion may persist longer but will ultimately be...

   • Submit

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

   • Contact

     This document provides contact information for PubChem.

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

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

   Chemical Element Data in PubChem. PubChem is providing this periodic table page in order to help navigate abundant chemical element data available in PubChem. When exploring the table or list views on this page, please note the links to dedicated pages for each element.

3. pubchem.ncbi.nlm.nih.gov › docs › structure-searchStructure Search - PubChem

   pubchem.ncbi.nlm.nih.gov › docs › structure-search

   PubChem Structure Search allows the PubChem Compound Database to be queried by chemical structure or chemical structure pattern.

4. People also ask

   What is 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 physical properties, biological activities, safety and toxicity information, patents, literature citations and more.

   PubChem

   pubchem.ncbi.nlm.nih.gov/

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   How can I access PubChem for free?

   • PubChem can be accessed for free through a web user interface. Millions of compound structures and descriptive datasets can be freely downloaded via FTP. PubChem contains multiple substance descriptions and small molecules with fewer than 100 atoms and 1,000 bonds. More than 80 database vendors contribute to the growing PubChem database.

   PubChem - Wikipedia

   en.wikipedia.org/wiki/PubChem

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   Who maintains PubChem?

   • The system is maintained by the National Center for Biotechnology Information (NCBI), a component of the National Library of Medicine, which is part of the United States National Institutes of Health (NIH). PubChem can be accessed for free through a web user interface.

   PubChem - Wikipedia

   en.wikipedia.org/wiki/PubChem

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   How does PubChem work with IUPAC?

   • PubChem is working with IUPAC to help make information about the elements and the periodic table machine-readable. (The machine-readable data used to render the periodic table on this page, are available for download by clicking the Download button at the top of this page.)

   Periodic Table of Elements - PubChem

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

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5. pubchem.ncbi.nlm.nih.gov › docs › compoundsCompounds - PubChem

   pubchem.ncbi.nlm.nih.gov › docs › compounds

   PubChem Compound records are derived summaries that give users access to a rich set of related content. Compound records contain unique chemical structures extracted from contributed Substance records through standardization.

6. en.wikipedia.org › wiki › PubChemPubChem - Wikipedia

   en.wikipedia.org › wiki › PubChem

   • Cached

   PubChem is a free online resource maintained by the NCBI that contains information on millions of chemical compounds and their biological activities. Users can search PubChem by various properties, such as structure, name, formula, and bioactivity, and access data from different sources and databases.

7. pubchem.ncbi.nlm.nih.gov › docs › search-and-toolsSearch and Tools - PubChem

   pubchem.ncbi.nlm.nih.gov › docs › search-and-tools

   Please enable Javascript in order to use PubChem website. An overview of search and other analysis capabilities in PubChem.

8. pubchem.ncbi.nlm.nih.gov › compound › Nitric-acidNitric Acid | HNO3 | CID 944 - PubChem

   pubchem.ncbi.nlm.nih.gov › compound › Nitric-acid

   The nitrate ion may persist longer but will ultimately be consumed as a plant nutrient. Nitric acid is removed from the gas phase in the lower atmosphere at temperatures lower than 195 K through the formation of crystalline nitric acid trihydrate; below 188 K, nitric acid is found in association with ice crystals (1).