Verified Answer :

The question ask to complete the said equation and find the best particle that could complete the equation. Base on my computation and calculation, I would say that the particle that is missing in the question is 1/0n. I hope you are satisfied with my answer and feel free to ask for more

Explanation:

The given reaction equation is as follows.

      \(^{14}_{7}N\) + ___ \(\rightarrow ^{14}_{6}C + ^{1}_{1}H\)

As there is release of one hydrogen which shows that mass number has increase by 1 on the product side.

Therefore, particle \(^{1}_{0}n\) must be added in order to balance the given reaction equation.

Hence, the complete reaction equation will be as follows.

      \(^{14}_{7}N + ^{1}_{0}n \rightarrow ^{14}_{6}C + ^{1}_{1}H\)