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A nucleus represented by the symbol ${ }_{\mathrm{A}}^{\mathrm{A}} \mathrm{X}$ has:
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Verified Answer
The correct answer is:
$\mathrm{Z}$ protons and $\mathrm{A}-\mathrm{Z}$ neutrons
$2=$ Number of protons
$A=$ Total number of protons and number
$\therefore$ Number of neutrons $\mathrm{A}=\mathrm{A}-\mathrm{Z}$
$A=$ Total number of protons and number
$\therefore$ Number of neutrons $\mathrm{A}=\mathrm{A}-\mathrm{Z}$
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