which of the following statements are TRUE of isotopes? i. isotopes of an element have the same chemical properties because they have the same number of electrons. ii. isotopes of elements are normally separated using physical properties. iii. isotopes of an element have the same number of protons in their nuclei.
i and ii only
i and iii only
ii and iii only
i, ii, and iii
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well let me add mine since correction is yet to be made by my school
D IS THE ANSWER
Let’s check each statement:
✅ i. Isotopes of an element have the same chemical properties because they have the same number of electrons.
✔️ True — Chemical properties depend on electron arrangement. Isotopes have the same atomic number → same electrons → same chemical behavior.
✅ ii. Isotopes of elements are normally separated using physical properties.
✔️ True — They differ in mass (mass number), so methods like diffusion or centrifugation separate them using physical differences.
✅ iii. Isotopes of an element have the same number of protons in their nuclei.
✔️ True — This is the definition of isotopes (same protons, different neutrons).
✅ Correct answer: D — i, ii, and iii
The isotopes have same atomic number and different mass number. Thus they have same number of protons and electrons and different number of neutrons and nucleons
