A radioactive nucleus X emits an alpha particle followed by two beta particles and forms nucleus Y . If the atomic mass number of Y is 189 then what is the atomic mass number of $X$ ?

Explanation

When a nucleus emits an alpha particle, its mass number decreases by 4 units. When it emits two beta particles, its mass number remains the same. Therefore, the mass number of X is 189 + 4 = 193.

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