Which of the following nuclear disintegrations takes place by α-emission?

i. ₉₂U²³⁸ → ₉₃Np²³⁸ ii.₉₀Th²³² → ₈₈Ra²²⁸ iii. ₈₄Po²¹⁰ → ₈₂Pb²⁰⁶ iv. ₈₃Bi²¹³ → ₈₄Po²¹³

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