Interactive Periodic Table
Browse the full 18-column periodic table colour-coded by element category, with the lanthanides and actinides shown in their own rows. Search by name, symbol or atomic number and select any element to see its atomic weight, group, period, block, electron configuration, Pauling electronegativity, common oxidation states and phase at standard conditions. Atomic weights follow the IUPAC abridged values.
How to use the Interactive Periodic Table
- Click any element, or use the arrow keys to move around the table.
- Type a name, symbol or atomic number in Search to highlight matches.
- Click a category in the legend to show only that family of elements.
- Read the full details in the panel below, and use Copy to save them.
Features
- All 118 elements with IUPAC standard atomic weights
- Mass number of the most stable isotope for radioactive-only elements, shown in brackets
- Electron configuration, electronegativity, oxidation states, block and phase
- Colour-coded categories with a clickable filter legend
- Keyboard navigation and horizontal scrolling with sticky period labels on phones
Benefits
- A quick reference for homework, lab reports and revision
- See periodic trends at a glance by category and block
- Works on any device without installing an app
Frequently asked questions
Where do the atomic masses come from?
They are the IUPAC abridged standard atomic weights. For elements with no stable isotopes, such as technetium or radon, the mass number of the longest-lived isotope is shown in square brackets.
Why do the lanthanides and actinides have no group number?
Elements 57–71 and 89–103 fill the f-block. They are drawn as two separate rows below the main table and are usually not given a group number from 1 to 18.
Why is electronegativity missing for some elements?
Pauling electronegativity has not been measured for helium, neon, argon or the superheavy elements, so no value is shown.
Are the properties of superheavy elements certain?
No. Only a few atoms of elements 104 and above have ever been made, so their electron configurations are theoretical predictions and their phase at room temperature is unknown.
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