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Nuclei — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsNuclei1 Mark
MCQ
A chlorine atom whose nucleus contains $17$ protons and $20$ neutrons. Find out the composition of the nucleus of an isotope of chlorine?
  • A
    $20$ protons, $17$ neutrons
  • B
    $19$ protons, $18$ neutrons
  • C
    $18$ protons, $18$ neutrons
  • ✓
    $17$ protons, $19$ neutrons
✓

Answer

Correct option: D.
$17$ protons, $19$ neutrons

Isotope nucleus means that those nucleus has same protons number but different neutrons and mass number. Since chlorine has $17$ protons so its isotope also will have $17$ protons.

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