Report copyright - CHEMISTRY HIgHER lEvEl PaPER 1 - IB Documents PAST PAPERS - SUBJECT...21 Sc 44.96 39 Y 88.91 La 138.91 22 Ti 47.90 40 Zr 91.22 72 Hf 178.49 58 Ce 140.12 90 Th 232.04 23 V 50.94 41
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