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Q.

A radioactive nucleus undergoes a series of decay according to the scheme A⟶αA1⟶β−A2⟶αA3⟶γA4 If the mass number and atomic number of A are 180 and 72 respectively, what are these numbers for A4?

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a

172,69

b

69,172

c

180,69

d

69,180

answer is A.

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Detailed Solution

Mass number of A4=172 Atomic number of A4=69for A1 z=70 ,A=176 FOR A2 Z=71, A=176 FOR A3  Z=69 , A=172  A4 is also same
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