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(D) The nuclear reaction is given by: ${}_{29}^{83}Cu + {}_{1}^{1}H \rightarrow 6{}_{0}^{1}n + {}_{2}^{4}\alpha + 2{}_{1}^{1}H + {}_{Z}^{A}X$Applying

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$8$

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(D) The nuclear reaction is given by: ${}_{29}^{83}Cu + {}_{1}^{1}H \rightarrow 6{}_{0}^{1}n + {}_{2}^{4}\alpha + 2{}_{1}^{1}H + {}_{Z}^{A}X$Applying the law of conservation of mass number: $83 + 1 = 6(1) + 4 + 2(1) + A$ $\Rightarrow 84 = 12 + A$ $\Rightarrow A = 72$Applying the law of conservation of atomic number: $29 + 1 = 6(0) + 2 + 2(1) + Z$ $\Rightarrow 30 = 4 + Z$ $\Rightarrow Z = 26$The element with atomic number $Z = 26$ is Iron $(Fe)$.Iron $(Fe)$ belongs to group $8$ of the periodic table.

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