Respuesta :

Answer:

Explanation:

D

Eduard22sly

The correct answer to the question is Option D. Ra-208

Let the parent atom be ʸₓB

From the question given above, we were told that the parent atom under goes alpha decay (i.e ⁴₂He) to produce ²⁰⁴₈₆Rn. The equation for the reaction is given below:

ʸₓB —> ²⁰⁴₈₆Rn + ⁴₂He

Next, we shall determine x, y and B. This can be obtained as follow:

for x:

x = 86 + 2

x = 88

For y:

y = 204 + 4

y = 208

For B:

ʸₓB => ²⁰⁸₈₈B => ²⁰⁸₈₈Ra

Thus, the complete equation is:

²⁰⁸₈₈Ra —> ²⁰⁴₈₆Rn + ⁴₂He

Therefore, the parent atom is ²⁰⁸₈₈Ra.

Option D. Ra-208 is the correct answer.

Learn more: https://brainly.com/question/11933822

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