Interactive periodic table
Click any element for its atomic mass, group, period, and particle counts. Use the type buttons to highlight a family, or search by name, symbol, or number.
Scroll sideways on a phone to see the whole table. Tap an element for details, or pick a type above to highlight it.
Using the table
Elements are arranged by atomic number, which is the number of protons. Rows are periods, and columns are groups of elements with similar chemistry. The two rows below the table are the lanthanides and actinides, which belong between groups 2 and 3.
Atomic masses are rounded standard values, the same ones used by the molar mass calculator. For elements with no stable isotopes, the number shown is the mass number of the most stable isotope instead. Neutron counts are an estimate for the most common isotope.