The isotope ${ }_{84}^{214} \mathrm{Po}$ undergoes one alpha and one beta particle emission sequentially to form an isotope " X ". The number of neutrons in " $X$ " is ____ .
Answer
Answer (as printed): 127
The options are missing from the source scan for this question, so there is nothing here for this letter to point at. The letter is what the book printed.