A radioactive nucleus X emits an alpha particle followed by two beta particles and forms nucleus Y . What is the general name of the elements X and Y ?
Explanation
When a radioactive nucleus emits an alpha particle, its atomic number decreases by 2 and its mass number decreases by 4. When it emits two beta particles, its atomic number increases by 2 and its mass number remains the same. Therefore, the general name of the elements X and Y is radioactive nuclei.
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