How many isotopes of nitrogen gas are stable? Which are they?
- A$1$,$^{14}N$
- B$2$,$^{14}N$ and $^{15}N$
- C$3$,$^{14}N$,$^{15}N$ and $^{16}N$
- D$4$,$^{13}N$,$^{14}N$,$^{15}N$ and $^{16}N$
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