Interactive Periodic Table

Explore all 118 elements with atomic properties, electron configurations, isotope data, and periodic trend visualizations. Click any element for details. Also: Equation Balancer | Molar Mass | Solutions.

Periodic Trends: Left to right across a period: atomic radius decreases, electronegativity increases, ionization energy increases. Down a group: atomic radius increases, electronegativity decreases, ionization energy decreases.
Periodic Table Categories: Alkali metals (Group 1), Alkaline earth metals (Group 2), Transition metals (Groups 3-12), Post-transition metals, Metalloids, Nonmetals, Halogens (Group 17), Noble gases (Group 18), Lanthanides, Actinides. Data from IUPAC, PubChem, and NIST.