In which one of the following pairs, the two species are both isoelectronic and isotopic ?
Channel: Doubtnut
Date: 2021-11-02

In which one of the following pairs, the two species are both isoelectronic and isotopic ? (At. Numbers : Ca = 20, Ar = 18, K = 19, Mg = 12, Fe = 26, Na = 11)