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From a radioactive substance x numbers o...

From a radioactive substance x numbers of `alpha`-particles any y numbers of `beta`-particles are emitted. As a result atomic number decreases by n and mass number by m. Then, match the following two columns.

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The correct Answer is:
`(Atoq; Btos; Cto p; Dtor)`
By the emission of an `alpha`-particle , atomic number decreases by 2nd mass number by 4. but by the emission of a `beta `-particle atomic number increase increase by 1 while mass number remains unchanged .
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