Interactive periodic table of elements. Click any element for detailed properties including atomic mass, electron configuration, and physical properties.
Solve math problems with the Periodic Table in three steps:
There are 118 known elements, from Hydrogen (H, atomic number 1) to Oganesson (Og, atomic number 118). 94 occur naturally, the rest are synthetic.
The table is arranged by atomic number. Rows are periods (7), columns are groups (18). Elements in the same group have similar chemical properties.
Lanthanides (57-71) and actinides (89-103) are the two rows below the main table, belonging to periods 6 and 7.
Oganesson (Og, element 118) with atomic mass 294, first synthesized in 2002.