IdentificationEasy1 mark
3(vii)
Curium is a radioactive element with the symbol (247, 96) Cm Cm named in honour of Madam Curie. The graph of number of protons vs number of neutrons for some elements are shown below :
Which point on the graph indicates daughter nucleus after Cm undergoes radioactive decay of 1α followed by 2β?
Topic: Successive alpha and beta decay
Question wording verified against source paper
Answer
Exam answer
Point R.
Explanation
After one α and two β⁻ emissions: A = 243 and Z returns to 96, so neutrons = 243 − 96 = 147, corresponding to R.
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