Ordered by atomic number · Select an element7 periods / 18 groups
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C6
EXPLORING
CarbonOther nonmetals
12.011 · Period 2
Atomic numberSymbolNameAtomic weight
57–71Ln
89–103An
Lanthanides Actinides On narrow screens, scroll the table sideways or use search to find an element.
[ ] denotes a representative isotope mass number, not a standard atomic weight.
Teaching categories; some superheavy classifications are predicted.