What is the mass number of the missing daughter nuclei?

90

Explanation:

The mass number of the missing daughter nuclei can be obtained as shown in the attached photo.

90

Explanation:

To calculate the mass number of the missing daughter nuclei, the equation must be balanced.

The sum of the mass number in the left hand side = 1 + 235 = 236

The sum of mass number in the right hand side must be equal to 236.

Then, 236 - (143 + 3×1)

236 - ( 143 + 3)

236 - 146 = 90

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explanation:

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