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Question

A radioactive nucleus undergoes a series of decay according to the scheme:
AaA1βA2αA3γA4


If the mass number and atomic number of `A' are 180 and 72 respectively, then the mass number and atomic number for A4:

A
172 and 69
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B
174 and 70
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C
176 and 69
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D
176 and 70
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Solution

The correct option is B 172 and 69
As we know, mass and charge of
α=4 and +2
β=0 and 1
γ=0 and 0

So AαA1βA2αA3γA4
m 180 176 176 172 172
e 72 70 71 69 69

So mass and charge of A4 is 172 & 69.

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