Report copyright - Chemistry Higher level Paper 1 - IB Documents PAST PAPERS - SUBJECT/Group 4 … · 2 4 Be 9.01 12 Mg 24.31 20 Ca 40.08 38 Sr 87.62 56 Ba 137.33 88 Ra (226) 89 57 ‡ Ac (227) 21 Sc
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