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igor_vitrenko [27]
4 years ago
10

Plz help me thanks ^-^

Chemistry
1 answer:
Vlad1618 [11]4 years ago
6 0

<u>Answer:</u> The isotopic symbol of unknown particle is _{2}^{4}\textrm{He}

<u>Explanation:</u>

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}

<u>To calculate A:</u>

Total mass on reactant side = total mass on product side

228 = A + 224

A = 4

<u>To calculate Z:</u>

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}

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