Which symbols represent atoms that are isotopes?

University of Ilorin CHM101 2015 past question

1. ¹⁴C and ¹⁴N
2. ¹⁶O and ¹⁸O
3. ¹³¹I and ¹³¹I
4. ²²²Rn and ³²²Rn

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