Question:
Which of the following pairs is an isobar?
Which of the following pairs is an isobar?
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Isobars are elements that have the same mass number but different atomic numbers.
Updated On: Apr 22, 2026
- \( ^1\text{H} \) and \( ^2\text{H} \)
- \( \text{H}^2 \) and \( \text{H}^3 \)
- \( ^6\text{C}^{12} \) and \( ^6\text{C}^{13} \)
- \( ^15\text{P}^{30} \) and \( ^14\text{Si}^{30} \)
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The Correct Option is D
Solution and Explanation
Step 1: Definition of isobars.
Isobars are atoms that have the same mass number but different atomic numbers. The mass number is the sum of the number of protons and neutrons in the nucleus. Isobars have different chemical properties because they have different atomic numbers (different elements), but the same mass number.
Step 2: Analyze the options.
- (1) \( ^1\text{H} \) and \( ^2\text{H} \): These are isotopes of hydrogen, not isobars, because they have different numbers of neutrons but the same atomic number. - (2) \( \text{H}^2 \) and \( \text{H}^3 \): These are also isotopes of hydrogen, not isobars. - (3) \( ^6\text{C}^{12} \) and \( ^6\text{C}^{13} \): These are isotopes of carbon, not isobars, because they have the same atomic number but different mass numbers. - (4) \( ^{15}\text{P}^{30} \) and \( ^{14}\text{Si}^{30} \): These are isobars, because they have the same mass number \( 30 \) but different atomic numbers (phosphorus and silicon).
Step 3: Conclusion.
The correct answer is (4), \( ^{15}\text{P}^{30} \) and \( ^{14}\text{Si}^{30} \).
Isobars are atoms that have the same mass number but different atomic numbers. The mass number is the sum of the number of protons and neutrons in the nucleus. Isobars have different chemical properties because they have different atomic numbers (different elements), but the same mass number.
Step 2: Analyze the options.
- (1) \( ^1\text{H} \) and \( ^2\text{H} \): These are isotopes of hydrogen, not isobars, because they have different numbers of neutrons but the same atomic number. - (2) \( \text{H}^2 \) and \( \text{H}^3 \): These are also isotopes of hydrogen, not isobars. - (3) \( ^6\text{C}^{12} \) and \( ^6\text{C}^{13} \): These are isotopes of carbon, not isobars, because they have the same atomic number but different mass numbers. - (4) \( ^{15}\text{P}^{30} \) and \( ^{14}\text{Si}^{30} \): These are isobars, because they have the same mass number \( 30 \) but different atomic numbers (phosphorus and silicon).
Step 3: Conclusion.
The correct answer is (4), \( ^{15}\text{P}^{30} \) and \( ^{14}\text{Si}^{30} \).
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