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Periodic Table Lookup
Look up any of the 118 elements by symbol, name or atomic number, with no network needed.
Find an element
Name: —
Symbol: —
Atomic number: —
Atomic mass: —
Category: —
Matches found: —
How to use the Periodic Table Lookup
- Type an element symbol, a name or an atomic number.
- Press Look up to find the matching element.
- Read the name, symbol, mass and category from the result panel.
Features
- All 118 elements built into the page
- Search by symbol, name or atomic number
- Atomic mass and element category for each entry
- Works offline with no network access
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Frequently Asked Questions
Common questions about the free online periodic table lookup.
All 118 confirmed elements are built in, from hydrogen at atomic number 1 up to oganesson at
atomic number 118.
Type a symbol such as Fe, a name such as iron, or an atomic number such as 26, then press
Look up to see the details.
Each entry gives the element name, symbol, atomic number, standard atomic mass and the
category such as halogen or noble gas.
No. The whole element table is part of the page, so every lookup keeps working offline once
the page has loaded.
The category field labels each element, for example alkali metal, transition metal,
metalloid, halogen, noble gas, lanthanide or actinide.
Atomic masses are given in unified atomic mass units, also called daltons, based on the
standard atomic weight of each element.
No. The search runs locally in your browser and no request is ever sent to any server.
Yes. The lookup is responsive and works on phones, tablets and desktop browsers alike.
Last updated: October 10, 2026