Isotopes means the addition of additional _ in the same proton number.
Correct answer: C. Neutrons
- A. Protons
- B. Electron
- C. Neutrons
- D. All of them
Explanation
Option C is correct since the isotopes are defined as elements having the same proton number but different nucleon numbers. This difference in nucleon numbers is due to the neutrons.Option A is incorrect since proton numbers are the same in isotopes of the same element.Option B is incorrect since electrons remain the same in isotopes of the same elements. The proton number of unionized species is equal to its number of electrons.Option D is incorrect since it states all of them, which is not the case.
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About Composition of Atomic Nuclei
Atomic nuclei contain positively charged protons and electrically neutral neutrons, collectively called nucleons. Questions use atomic number, mass number and nuclear notation to identify isotopes, isobars and isotones, and may connect nuclear composition with nuclear charge, mass defect, binding energy and the stability of the nucleus.
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