Due to the lanthanide contraction phenomenon, the REE are further divided into larger LREE (light Ln, La–Sm), medium MREE (Sm–Dy) and smaller HREE (heavy Ln, Tb–Lu and Y).
Source: wiktionary
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Due to the lanthanide contraction phenomenon, the REE are further divided into larger LREE (light Ln, La–Sm), medium MREE (Sm–Dy) and smaller HREE (heavy Ln, Tb–Lu and Y).
Source: wiktionary
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.