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Periodic table

Search by name, symbol or atomic number, or pick any element from the table, and its details appear: the atomic number, symbol, standard atomic weight, category, group and period.

The whole table is held in the page from standard data, so it works offline once loaded and sends nothing anywhere.

Pick an element to see its details. Everything is a reference; nothing is stored or sent anywhere.

  • alkali metal
  • alkaline earth metal
  • transition metal
  • post-transition metal
  • metalloid
  • nonmetal
  • halogen
  • noble gas
  • lanthanide
  • actinide

Questions

Is anything I type sent anywhere?
No. Every tool here runs in the page itself. There is no server that receives your grades, your essay or your sources, and you can check it in your browser's network tab: using a tool produces no request carrying what you typed.
Where does the data come from?
The standard IUPAC atomic weights, vendored into the page rather than fetched, so the table loads instantly and works with no connection. The masses are to four significant figures.
How do I find an element quickly?
Type its name, its symbol or its atomic number in the search box and the matches stay bright while the rest dim. Then click it, or any element in the grid, to read its details.
What do the colours mean?
Each colour is a category: alkali metal, noble gas, halogen and so on, listed in the key under the table. They group elements that behave alike, which is much of what the table is for.

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