In a radioactive decay chain, (232,90)Th nucleus decays to (212,82)Pb nucleus.
In a radioactive decay chain, 23290Th nucleus decays to 21282Pb nucleus. Let Nα and Nβ be the number of α and β- particles, respectively, emitted in this decay process. Which of the following statements is (are) true?
(A) Nα = 5
(B) Nα = 6
(C) Nβ = 2
(D) Nβ = 4
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Answer (A,C)
solution
23290Th is converting into 21282Pb
Change in mass number (A) = 20
∴ no of α particle =20/4 = 5
Due to 5α particle, z will change by 10 unit.
Since given change is 8, therefore no. of β particle is 2
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