In a decay of ₉₀Th²³² by emission of an alpha particle, the daughter nucleus will be A) "₉₂U²³²." B) "₉₀Th²²⁸." C) "₈₇Ac²³²." D) "₈₈Ra²³⁰." E) "₈₈Ra²²⁸."

Question

Quizplus · Accepted Answer

When a nucleus emits an alpha particle, its atomic number decreases by 2 and its mass number decreases by 4. Therefore, the correct answer is the one that reflects these changes.

In a Decay of 90Th232 by Emission of an Alpha

In a Decay of ₉₀Th²³² by Emission of an Alpha