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# A Radioactive Nucleus ‘A’ Undergoes a Series of Decays According to the Following Scheme:The Mass Number and Atomic Number of a Are 180 and 72 Respectively. What Are These Numbers for A4? - Physics

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A radioactive nucleus ‘A’ undergoes a series of decays according to the following scheme: The mass number and atomic number of A are 180 and 72 respectively. What are these numbers for A4?

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#### Solution

A has mass number as 180 and atomic number 172.

Formation of A1 by α-decay: Formation of A2 by β decay: Formation of A4:

In r-decay, mass number and atomic number remain the same.

Thus, Mass number of A4 = 172

Atomic number of A4­ = 169

Concept: Radioactivity - Law of Radioactive Decay
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