The periodic table organises every known chemical element by increasing atomic number into rows (periods) and columns (groups) that reflect recurring chemical behaviour. This lookup lets you find any of the 118 elements instantly by name, symbol, or atomic number and read its core properties.
How it works
The table is sorted by atomic number Z, which is the number of protons in the
nucleus and the defining identity of an element. As you type, the list filters on
three fields at once: the element name, its chemical symbol, and its atomic
number. An element’s position is fixed by two coordinates:
- Group (column 1 to 18) groups elements with similar valence-electron structure and therefore similar chemistry.
- Period (row 1 to 7) corresponds to the highest occupied principal energy level.
Electron configurations are shown in noble-gas core shorthand: the symbol of the
preceding noble gas in brackets stands in for the filled inner shells, followed
by the outer sub-shells. Reading [Ne] 3s2 3p4 for sulfur tells you it has a
neon core plus six outer electrons.
Notes and examples
Searching 26 jumps straight to iron (Fe); searching noble is not supported,
but searching the symbol Fe or the name iron both work. The f-block
lanthanides and actinides show a dash for group because, in the conventional
18-column layout, they are pulled out below the main body and do not occupy a
numbered group. For radioactive elements such as technetium or the superheavy
period-7 elements, the listed mass is the mass number of the most stable isotope,
which is why those values are whole numbers.