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Revision questions Complete the following questions. 1) Calculate the relative atomic of boron given that its two isotopes " and "Bhave relative abundances of 18.7% and 81.3% respectively. 2) Write equations showing the a-decay of the following radioisotopes (a) 2 (b) 2 Ra 3) Write equations showing the B-decay of the following radioisotopes: (a) Th 234 (b) MC