About the Periodic Table
The periodic table organizes all 118 known chemical elements by increasing atomic number. Elements in the same column (group) share similar chemical properties because they have the same number of electrons in their outer shell.
The table is arranged in 7 periods (rows) and 18 groups (columns). The lanthanides (elements 57-71) and actinides (elements 89-103) are shown separately below the main table to keep the layout compact.
Atomic mass values shown are the standard atomic weights. For elements without stable isotopes, the mass number of the longest-lived isotope is shown in brackets. Electron configuration follows the standard notation with noble gas core abbreviation.
Click any element to see its full details including atomic mass, electron configuration, group, period, and element category.
Privacy & Limitations
- All calculations run entirely in your browser -- nothing is sent to any server.
- Results are computed using standard formulas and should be verified for critical applications.
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Periodic Table FAQ
What is Periodic Table?
Periodic Table is a free education tool that helps you Interactive periodic table with atomic data, electron configurations, and search.
How do I use Periodic Table?
Enter your input values, review the calculated output, and adjust inputs until you reach the result you need. The result updates in your browser.
Is Periodic Table private?
Yes. Calculations run locally in your browser. Inputs are not uploaded to a server by default, and refreshing the page clears session data.
Does Periodic Table require an account or installation?
No. You can use this tool directly in your browser without sign-up or software installation.
How accurate are results from Periodic Table?
This tool applies standard formulas or deterministic processing logic for estimates. For medical, legal, tax, or investment decisions, verify with a qualified professional.
Can I save or share outputs from Periodic Table?
You can bookmark this page and copy outputs manually. Results are not persisted in your account and are typically not embedded in the URL.