Question
What are isotopes?
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| Isobars | Atomic No.(Z) | Mass No.(A) | Number of Protons(Z) | No. of Neutrons(N) |
| ${ }_6^{14} \mathrm{C}$ | 6 | 14 | 6 | |
| ${ }_7^{14} \mathrm{C}$ | 7 | 14 | 7 |
| Isotope | Atomic mass | Natural Abundance |
| $^{20}Ne$ | $19.9924 \ u$ | $90.92\%$ |
| $^{21}Ne$ | $20.9940 \ u$ | $0.26\%$ |
| $^{22}Ne$ | $21.9914 \ u$ | $8.82\%$ |