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the claim
Lanthanum and actinium are classified as the prototype elements of the lanthanide and actinide series
the verdict
SUPPORTED
the evidence backs this
refutedsupported
the weight of evidence
2 sources for · 0 against
AS REPORTEDno primary record reached; this is what the reporting says

Evidence confirms both lanthanum and actinium are recognized as the prototype elements for their respective series.

Evidence for · 2
Wikipedia: Lanthanum
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Reference article covering this claim directly
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Judged against reference works: claims of this kind are settled by reference works, not journal abstracts.

More for · 1
Wikipedia: Actinium
cited by 0
Reference article covering this claim directly
The paper trail · every fact has a biography
first checked04 Aug 2026
judged → SUPPORTED · 7504 Aug 2026
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