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(D) In a nuclear reaction,both the total atomic number $(Z)$ and the total mass number $(A)$ must be conserved on both sides of the equation.Given rea

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(D) In a nuclear reaction,both the total atomic number $(Z)$ and the total mass number $(A)$ must be conserved on both sides of the equation.Given reaction: ${ }_4^9 Be + { }_2^4 He \rightarrow { }_6^{12} C + x$Let the particle $x$ be represented by ${ }_Z^A X$.Conservation of mass number $(A)$: $9 + 4 = 12 + A \Rightarrow 13 = 12 + A \Rightarrow A = 1$.Conservation of atomic number $(Z)$: $4 + 2 = 6 + Z \Rightarrow 6 = 6 + Z \Rightarrow Z = 0$.The particle with mass number $1$ and atomic number $0$ is a neutron,denoted as ${ }_0^1 n$.

What is the particle $x$ in the following nuclear reaction :
${ }_4^9 Be+{ }_2^4 He \rightarrow{ }_6^{12} C+x$

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What is the particle $x$ in the following nuclear reaction :${ }_4^9 Be+{ }_2^4 He \rightarrow{ }_6^{12} C+x$