Which one of the following pairs represents isobars?
- A$_{2}^{3}He$ and $_{2}^{4}He$
- B$_{12}^{24}Mg$ and $_{12}^{25}Mg$
- C$_{19}^{40}K$ and $_{20}^{40}Ca$
- D$_{19}^{39}K$ and $_{19}^{40}K$
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The atoms $_6C^{13}$ and $_8O^{17}$ are related to each other as .......
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