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, …

GHS, the Globally Harmonized System of Classification and Labeling of Chemicals, was developed by the United Nations as a way to bring into agreement the chemical regulations …

Acetaminophen (paracetamol), also commonly known as Tylenol, is the most commonly taken analgesic worldwide and is recommended as first-line therapy in pain conditions by the World …

Cocaine is a tropane alkaloid obtained from leaves of the South American shrub Erythroxylon coca. It has a role as a local anaesthetic, a central nervous system stimulant, a sodium …

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

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

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

PERIODIC TABLE OF ELEMENTS

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 …

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