118 elements. A closer look at the matter around us.
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Hover to preview · Click to exploreAtomic number · Symbol · Atomic weight
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123456789101112131415161718
C
6 / 12.011
CarbonOther nonmetals
57–71↓
89–103↓
Lanthanides 57–71Actinides 89–103
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About the values & sources
Atomic weights are abridged standard values; brackets identify a selected isotope’s mass number where no standard atomic weight exists. Element families follow a conventional classroom classification. Some boundaries, including the metalloid set, are not uniquely defined.
Half-life is an isotope property. The isotope panel shows a selected set, not every known nuclide. “Stable” means no decay is observed in the cited evaluation, not proof of an infinite lifetime. Unavailable properties remain unassigned; predicted and pressure-dependent values are noted.
