Isotopes of a given element all have the same:
Correct answer: D. proton number
- A. charge/mass ratio
- B. neutron number
- C. nucleon number
- D. proton number
Explanation
The correct option is d) Proton number. Isotopes of a given element all have the same number of protons, and it is the number of protons that determines the element's identity on the periodic table. They differ in their neutron numbers and thus have different nucleon numbers (mass numbers).
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