Question

What nuclide is necessary to balance the following fission reaction?235 U + 1n ---> ______ + 3 1n + 139Baa. 96Rbb. 96Brc. 96 Krd. 94 Kr

Answer 1

Answer: The isotopic symbol that is used to balance the fission reaction is
`_(36)^(94)\textrm{Kr}`

Step-by-step explanation:

In a nuclear reaction, the total mass and total atomic number remains the same.

For the given fission reaction:

`^(235)_(92)\textrm{U}+_0^1\textrm{n}\rightarrow ^A_Z\textrm{X}+^(139)_(56)\textrm{Ba}+3^1_0\textrm{n}`

• To calculate A:

Total mass on reactant side = total mass on product side

235 + 1 = A + 139 + 3

A = 94

• To calculate Z

Total atomic number on reactant side = total atomic number on product side

92 + 0 = Z + 56 + 0

Z = 36

Hence, the isotopic symbol that is used to balance the fission reaction is
`_(36)^(94)\textrm{Kr}`