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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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Chlorine and calcium
Potassium and chlorine
Argon and calcium
Potassium and argon

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detailed solution

Correct option is C

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

Ex:  1840Ar   2040Ca . 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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