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A radioactive nucleus A undergoes a seri...

A radioactive nucleus A undergoes a series of decays as given below.

The mass number and atomic number of are 176 and 71 respectively.
Determie the mass and atomic number of A4 and A.

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Determining the mass and atomic number of A4 and A.
`A_(4)`: Mass number :172
Atomic number : 69
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