Periodic Table of the Elements
Click an element to see its properties. Atomic weights are the IUPAC standard values, updated to the 2024 CIAAW revision.
Free, licensed CC BY 4.0: print it, copy it and share it with attribution.
57–7189–103
Click an element to see its data.
Click an element to see its data.
- Alkali metals
- Alkaline earth metals
- Transition metals
- Post-transition metals
- Metalloids
- Nonmetals
- Halogens
- Noble gases
- Lanthanides
- Actinides
Sources and notes
Abridged atomic weights (at most 5 significant figures); in square brackets the mass number of the longest-lived isotope, for elements without a standard atomic weight. Physical state at 25 °C and 1 atm.
- IUPAC CIAAW, standard atomic weights (2024 revision of Zr, Gd, Lu)
- IUPAC, Periodic Table of the Elements (official PDF)
- mendeleev by L. M. Mentel (MIT): configurations, electronegativity, ionisation energies (NIST), densities
- PubChem Periodic Table (NIH), for further reading
Data version: 2026-09 · CC BY 4.0 · Tommaso Francese