Chlorine, argon, potassium, calcium have numbers of electrons as 17, 18, 19, 20 respectively. Their nucleus contains 18, 22, 20, 20 neutrons respectively. The pair of isobars are

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Argon and calcium

Chlorine and calcium

Potassium and chlorine

Potassium and argon

answer is C.

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Detailed Solution

The elements Argon and Calcium contain same mass number but different atomic numbers. Hence they are set to be isobars.

Ex: $_{18}^{40} {Ar}_{20}^{40} Ca$ . Number of neutrons should be different in isobars.

For Ca, number of neutrons n = 20; For Ar, number of neutrons n = 22.

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