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Please explain this question to me. i am detting answer (a)but it is given as (B) in answer key

Please explain this question to me. i am detting answer (a)but it is given as (B) in answer key
 
 

Question Image
Grade:12

1 Answers

suvidhi mehta
292 Points
3 years ago
i think u mistook 2 positrons to be electrons 
after 3 alpha emission mass no = A-12 and atomic no Z-6
after 2 positron emission mass no = A-12 and atomic no= Z-8 
so finally no of protons = Z-8 and no of neutrons = (A-12)-(Z-8)= A-Z-4
 

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