Which of the following is the pair of isobars?
Correct answer: D. 40CI, 40Ar
- A. 1H1 and 2H1
- B. 30H15 and 30Si14
- C. 12C6, 16O8
- D. 40CI, 40Ar
Explanation
Isobars are atomic species that have the same mass number (A), but a different atomic number (Z). This can only be seen in option D. Isobars should not be confused with isotopes, which share the same atomic number, and therefore belong to the same chemical element, but have varying mass numbers.
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