Set of nuclear decay reactions illustrating alpha and beta decay, with elements such as Uranium, Thorium, Protactinium, and others undergoing radioactive decay.

Looking at the image, we see eight nuclear equations labeled (a) through (h). Each equation shows a radioactive decay or nuclear reaction. The red parts are likely the answers — meaning they’re the products that were missing or needed to be filled in.

Let’s go one by one and verify if the red parts are correct based on conservation of mass number (top number) and atomic number (bottom number).

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(a) ²³⁸₉₂U → ²³⁴₉₀Th + ⁴₂He
Left: mass = 238, atomic = 92
Right: 234 + 4 = 238; 90 + 2 = 92 → ✔ Correct

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(b) ²³⁴₉₀Th → ²³⁴₉₁Pa + ⁰₁e
Left: mass = 234, atomic = 90
Right: 234 + 0 = 234; 91 + (-1) = 90 → ✔ Correct (beta decay)

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(c) ²³⁴₉₁Pa → ²³⁰₈₉Ac + ⁴₂He
Left: mass = 234, atomic = 91
Right: 230 + 4 = 234; 89 + 2 = 91 → ✔ Correct (alpha decay)

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(d) ²²⁰₈₆Rn → ²¹⁶₈₄Po + ⁴₂He
Left: mass = 220, atomic = 86
Right: 216 + 4 = 220; 84 + 2 = 86 → ✔ Correct

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(e) ²¹⁶₈₄Po → ²¹⁶₈₅At + ⁰₋₁e
Left: mass = 216, atomic = 84
Right: 216 + 0 = 216; 85 + (-1) = 84 → ✔ Correct (beta decay)

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(f) ²¹⁶₈₄Po → ²¹²₈₂Pb + ⁴₂He
Left: mass = 216, atomic = 84
Right: 212 + 4 = 216; 82 + 2 = 84 → ✔ Correct

Note: There are underscores around “²¹²₈₂Pb” — probably indicating it was the blank to fill.

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(g) ²¹⁰₈₃Bi → ²¹⁰₈₄Po + ⁰₁e
Left: mass = 210, atomic = 83
Right: 210 + 0 = 210; 84 + (-1) = 83 → ✔ Correct

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(h) ¹₀n + ¹⁰B → ₃Li + ⁴₂He
Left: mass = 1 + 10 = 11; atomic = 0 + 5 = 5
Right: 7 + 4 = 11; 3 + 2 = 5 → ✔ Correct

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All red parts are correctly filled in according to conservation laws.

Since the user didn’t ask for explanation, teaching, or practice — and only wants the final answer — and since this is not a single question but a set of verified equations, the “final answer” is that all the red portions shown are correct.

But note: the instruction says “Provide only the final correct answer”. Since there’s no explicit question like “which is wrong?” or “fill in the blank”, and all are already filled correctly, perhaps the task was to verify them? Or maybe the original problem had blanks and these are the answers?

Given the context, and since the red text appears to be the solutions, and all are correct, the final answer is:

Final Answer: All equations are correctly balanced with the red parts as shown.