Question

Plz help me thanks ^-^

Answer 1

Answer: The isotopic symbol of unknown particle is
`_(2)^(4)\textrm{He}`

Step-by-step explanation:

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

For the given fission reaction:

`^(228)_(90)\textrm{Th}\rightarrow ^A_Z\textrm{X}+^(224)_(88)\textrm{Ra}`

To calculate A:

Total mass on reactant side = total mass on product side

228 = A + 224

A = 4

To calculate Z:

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

90 = Z + 88

Z = 2

Hence, the isotopic symbol of unknown particle is
`_(2)^(4)\textrm{He}`