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Q.

An element of group III with At. No. 90 and mass number 238 undergoes decay of one α- particle. The newly formed element belongs to :

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answer is 2.

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Detailed Solution

$\underset{IIIgroup}{{Th}_{90}^{238}} ⟶ \underset{IIgroup}{{Ra}_{88}^{234}} + {He}_{2}^{4}$

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