A nucleus represented by the symbol ${ }_{\mathrm{A}}^{\mathrm{A}} \mathrm{X}$ has:

A nucleus represented by the symbol ${ }_{\mathrm{A}}^{\mathrm{A}} \mathrm{X}$ has:
  1. $\mathrm{Z}$ neutrons and $\mathrm{A}-\mathrm{Z}$ protons
  2. $\mathrm{Z}$ protons and $\mathrm{A}-\mathrm{Z}$ neutrons
  3. $\mathrm{Z}$ protons and $\mathrm{A}$ neutrons
  4. $\mathrm{Z}$ protons and $\mathrm{Z}-\mathrm{A}$ neutrons

Solution

$2=$ Number of protons $A=$ Total number of protons and number $\therefore$ Number of neutrons $\mathrm{A}=\mathrm{A}-\mathrm{Z}$

Asked in: NEET 2004

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