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Question

A radioactive element AZX loses two successive βparticles and an αparticles such that resulting nuclide is PQY. Find the values of P and Q in terms of A and Z.
[5 MARKS]

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Solution

Reaction: 2 Marks
Symbols: 1 Mark
Representation of P and Q: 2 Marks

The symbolic representation of the reaction is as follows:
AZXβparticle−−−−−Mβparticle−−−−−Nαparticle−−−−−PQY
From the above, the symbol of
M=AZ+1M and N=AZ+2N
Since, N nucleus loses one alpha - particle, therefore, the new nucleus has:
mass number = A - 4
Atomic number = Z + 2 - 2 = Z
Hence, P = A - 4 and Q = Z

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