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Promethium is the rarest naturally occurring rare earth element in the lanthanide series. It is radioactive and not found in significant quantities in the Earth's crust, making it one of the least abundant elements on Earth.

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Q: What is a rare earth element in the lanthenide series?
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Is helium a family name or a rare earth element series?

family name of rare earth element series of helium


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What is Xenon's rare earth element series?

Xenon is a noble gas and does not belong to the rare earth element series. The rare earth elements are a group of lanthanide elements, plus scandium and yttrium, that have similar chemical properties. Xenon is located in group 18 of the periodic table.


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