MCQ
Which of the following pair indicates isotopes?
- ✓${ }_{17} \mathrm{Cl}^{35},{ }_{17} \mathrm{Cl}^{37}$
- B${ }_{18} \mathrm{Ar}^{40}{ }_{20} \mathrm{Ca}^{40}$
- C${ }_6 \mathrm{C}^{13}{ }_7 \mathrm{~N}^{14}$
- D${ }_{33} \mathrm{As}^{77},{ }_{34} \mathrm{Se}^{78}$