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118 elements. One connected world.
Drag to orbit, Shift-drag or right-drag to pan, and scroll to zoom. On touch screens, use one finger to rotate and two fingers to pan or pinch. Click or tap a card to approach it and open its profile. “Back to view” returns to where you were; “Overview” fits the formation.
Focus the world with Tab. Arrow keys orbit; Shift + arrows pan. + and − zoom, R fits the formation, and Escape closes a profile and returns to the previous view. Use the Element list or search results to select any element with Tab and Enter. Layouts and filters also work with a keyboard.
The Table shows conventional groups and periods. Helix, Sphere, and Grid are spatial visualizations; they do not change chemical relationships. The separate lanthanide and actinide rows belong to periods 6 and 7.
Open Orbitals, enter a configuration such as 1s2 2s2 2p4 or [Ar] 3d6 4s2, and choose Visualize configuration. Overall view shows all occupied orbitals together; toggle layers to see inside. Choose a subshell, then an orbital box for its detailed shape and occupancy. Return with “Overall view.” Shapes and shell spacing are schematic, with radial nodes omitted; use “How to read this model” for the scientific notes.
Pink outlines mark the s-block (including helium), orange the d-block, blue the p-block, and purple the detached f-block series. The f-series include all lanthanides and actinides in this compact layout; the placement of their end elements varies by convention.
The atomic number counts protons. A neutral atom has the same number of electrons. The period is its horizontal row. Main-group valence counts use the outer shell; transition-metal counts include s and d electrons.
Atomic masses use the CIAAW abridged standard atomic weights, including the 2024 revisions, with uncertainties shown in each profile. These are averages for normal terrestrial materials; individual isotopes have different masses. Standard atomic weight is dimensionless; its numerical value gives the corresponding average atomic mass in u.
Bracketed integers come from the IUPAC May 2022 periodic table. They identify the mass number (protons + neutrons) of the isotope with the longest confirmed half-life in that edition, not a standard atomic weight or exact isotope mass.
Valence conventions follow OpenStax’s electron-configuration discussion. For d-block elements we show the formal s + d count; it is not a bond count or oxidation state. For lanthanides and actinides we show the outermost-shell count; f and d electrons can also participate in bonding. Lawrencium uses the 7s²7p¹ ground-state assignment.
Categories are an educational convention: group 12 is included with the transition metals, polonium with post-transition metals, and astatine with halogens. Superheavy-element categories and main-group valence counts follow table position; their chemistry is not fully established. See the Royal Society of Chemistry for individual references.
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Explore all 118 elements in an accessible list.
Element Atlas needs JavaScript for its interactive world. Scientific references: Royal Society of Chemistry periodic table.