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lantern
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lanthanide
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lanthanide series
lan·tha·nide se·ries
noun
Definition:
rare-earth group:
a group of the rare earths that range from lanthanum at atomic number 57 to lutetium at atomic number 71
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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