Answer: [tex]_{0}^{1}\textrm{e}[/tex] is missing
Explanation:
In a nuclear reaction, the total mass and total atomic number remains the same.
For the given reaction:
[tex]^{4}_{2}\textrm{He}+^9_4\textrm{Be}\rightarrow ^{12}_{6}\textrm{C}+^A_Z\textrm{X}[/tex]
To calculate A:
Total mass on reactant side = total mass on product side
4 + 9 = 12 + A
A = 1
To calculate Z:
Total atomic number on reactant side = total atomic number on product side
2 + 4 = 6 + Z
Z = 0
[tex]^{4}_{2}\textrm{He}+^9_4\textrm{Be}\rightarrow ^{12}_{6}\textrm{C}+^1_0\textrm{e}[/tex]
Hence, missing is [tex]_{0}^{1}\textrm{e}[/tex].
