Interactive periodic table
The complete periodic table with all 118 elements: click to see the atomic number, atomic mass, family, period and group, and search by name or symbol.
How to usePeriodic table of the elements
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Interactive periodic table: what it is for
See the complete periodic table, with all 118 elements in 7 periods and 18 groups, colored by category: alkali metals, alkaline earth metals, transition metals, metalloids, nonmetals, halogens, noble gases, lanthanides and actinides. Click an element to see its name, symbol, atomic number, atomic mass, period and group, or search by name, symbol or number.
Everything runs in your browser, with the IUPAC standard atomic masses.
How to use
- Click an element in the table.
- Or type the name, symbol or number in the search box.
- See the element's data below the table.
When to use it
- Studying high school chemistry.
- Looking up atomic masses for exercises.
- Identifying an element's family.
Frequently asked questions
How is the periodic table organized?
The elements follow the order of their atomic number, which is the number of protons. The rows are the 7 periods, which indicate the number of electron shells, and the columns are the 18 groups or families, which bring together elements with similar properties.
Which families have names?
Group 1: alkali metals. Group 2: alkaline earth metals. Group 17: halogens. Group 18: noble gases. Groups 3 to 12 are the transition metals, and the lanthanides and actinides are in the two bottom rows.
Why do some elements have a mass with no decimals?
They are radioactive elements with no stable isotope. In those cases the mass number of the most stable known isotope is shown.
Is it really free?
Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 tools are free and run right in your browser.