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In the following nuclear reaction, $D \overset{α}{\to} D_{1} \overset{β^{-}}{\to} D_{2} \overset{α}{\to} D_{3} \overset{γ}{\to} D_{4}$ Mass number of D is 182 and atomic number is 74. Mass number and atomic number of D₄ respectively will be ______

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An Intiative by Sri Chaitanya

174 and 71

174 and 69

172 and 69

173 and 69

answer is A.

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Detailed Solution

${}_{74}^{182}D \overset{α}{\to} {}_{72}^{178}{D_{1}} \overset{β^{-}}{\to} {}_{73}^{178}{D_{2}} \overset{α}{\to} {}_{71}^{174}{D_{3}} \overset{γ}{\to} {}_{71}^{174}{D_{4}}$

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