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Interactive Periodic Table of Elements — Free Reference
An interactive periodic table covering all 118 elements. Click any element for its atomic number, atomic mass, symbol, electron configuration, group, period and category — a quick reference for chemistry homework, lab work and revision.
How to use Periodic Table
- Browse the table or search for an element.
- Click an element to open its details.
- Read atomic number, mass and electron configuration.
Frequently asked questions
- How many elements are in the periodic table?
- 118 confirmed elements, from hydrogen (1) to oganesson (118).
- What do the groups and periods mean?
- Periods are the horizontal rows (matching the outer electron shell); groups are the vertical columns, whose members share similar chemical behaviour.
- Why are some atomic masses in brackets?
- Brackets mark elements with no stable isotope, where the value shown is the mass number of the most stable known isotope.
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