Select an element to see its details.
Standard atomic weights follow the IUPAC abridged values; masses in brackets are mass numbers of the longest-lived isotope. Electronegativity is on the Pauling scale where a reliable value exists.
How to use Interactive Periodic Table
Tap an element for its atomic mass, electron configuration and properties. Colour the table by category, block, state or a property trend.
- Choose how to colour the table: category, block, state at 20 °C or a property heatmap.
- Tap or select an element to see its details below the table.
- Search by name, symbol or number to highlight an element.
Questions
How many elements are there?
118 elements are named and confirmed, from hydrogen (1) to oganesson (118).
Why are lanthanides and actinides shown separately?
Elements 57–71 and 89–103 fill f orbitals. Placing them in two rows below keeps the table a readable width; the gaps in group 3 mark where they belong.
Where does the data come from?
Standard atomic weights follow the IUPAC abridged values; masses in brackets are mass numbers of the longest-lived isotope. Electronegativity is on the Pauling scale where a reliable value exists.