Question

identify the pair (2) isotopes?

Explanation:

Isotopes are atoms of the same element (same number of protons) with different numbers of neutrons.

• In option A: Different number of protons (6 vs 9), so not isotopes.
• In option B: Same number of protons (6) and same number of neutrons (6), so not isotopes (they are identical atoms).
• In option C: Same number of protons (6) and same number of neutrons (6), so not isotopes (they are identical atoms).
• In option D: Same number of protons (6) but different number of neutrons (6 vs 7), so they are isotopes.

Answer:

D.