Click any element for details (English & Chinese names, atomic mass, group/period, electron configuration, common uses). Search by symbol, English name, Chinese name or atomic number. Category buttons highlight one family and dim the rest. Lanthanides 57–71 and actinides 89–103 are placed in two rows below for compactness; their actual positions are column 3 of periods 6 and 7. Masses in [brackets] are the most stable isotope's mass number for radioactive elements.