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In a radioactive decay chain, the initial nucleus is 23290Th. At the end there are 6 a-particles and 4b-particles

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In a radioactive decay chain, the initial nucleus is 23290Th. At the end there are 6 a-particles and 4b-particles which are emitted. If the end nucleus is AZX, A and Z are given by : 

(1) A = 202; Z = 80 

(2) A = 208; Z = 80 

(3) A = 200; Z = 81 

(4) A = 208; Z = 82

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Correct option:  (4) A = 208; Z = 82

Explanation:

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