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Q.

A radioactive nucleus undergoes a series of decays according to the sequence A⟶βA1⟶αA2⟶αA3. If the mass number and atomic number of A3 are 172 and 69 respectively, then the mass number and atomic number of A is

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a

56, 23

b

180, 72

c

120, 52

d

84, 38

answer is B.

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Detailed Solution

A⟶ρA1⟶αA2⟶αA3 72X180⟶ −1073X180 ⟶ 2He4 X 176 71  71X176 ⟶ 2He469X172
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A radioactive nucleus undergoes a series of decays according to the sequence A⟶βA1⟶αA2⟶αA3. If the mass number and atomic number of A3 are 172 and 69 respectively, then the mass number and atomic number of A is