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A nucleus of an element ${}_{84}X^{202}$ 3emits an $α$ -particle first, a $β$ -particle next and then a gamma photon. The final nucleus formed has an atomic number

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198

200

199

answer is C.

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Detailed Solution

${}_{84}X^{202} \overset{α - decay}{\to} {}_{82}Y^{198} + {}_{2}{He}^{4} and {}_{82}Y^{198} \overset{β - decay}{\to} {}_{83}Z^{198} +_{- 1} β^{0}$

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