Periodic Table
The periodic table: 118 elements, coloured by category. Click any element to see its details. Atomic masses are standard atomic weights; values in square brackets are the mass number of the most stable isotope.
Alkali metal
Alkaline earth metal
Transition metal
Post-transition metal
Metalloid
Nonmetal
Halogen
Noble gas
Lanthanide
Actinide
Click an element to see its name, atomic number, atomic mass, and category.