Which of the following is the lowest atomic mass lanthanide?

Question

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Lanthanides are elements with atomic numbers ranging from 57 to 71. Among these, cerium (Ce) has the lowest atomic mass of 140.12 g/mol. The others have higher atomic masses: Lr (lawrencium) does not belong to the lanthanide series, while Lu (lutetium) has an atomic mass of 174.97 g/mol, Sc (scandium) has an atomic mass of 44.96 g/mol, and Th (thorium) has an atomic mass of 232.04 g/mol.

Which of the Following Is the Lowest Atomic Mass Lanthanide