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Nuclei — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsNuclei1 Mark
MCQ
Isotopes of an element contain:
  • A
    The same number of protons but different number of neutrons.
  • B
    The same number of neutrons but different number of protons.
  • C
    Equal number of protons and electrons.
  • D
    Equal number of nucleons.
✓

Answer

  1. The same number of protons but different number of neutrons.

Explanation:

Isotopes of an element must have same atomic number (Z) but different mass number A.

Number of protons is equal to the atomic number.

So, isotopes of an element have same number of protons.

Mass number is equal to the sum of number of protons and neutrons i.e. A = p + n

As isotopes of an element have different mass number but same number of protons, thus they must have different number of neutrons.

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