A radioactive nucleus X emits an alpha particle followed by two beta particles to form nucleus Y. If the atomic number of Y is 80 then what is the atomic number of X ?
Explanation
When a radioactive nucleus emits an alpha particle, its atomic number decreases by 2 and its mass number decreases by 4. Then, when it emits two beta particles, its atomic number increases by 2. So, the net change in atomic number is 0. Given that the atomic number of Y is 80, the atomic number of X is also 80.
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