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

see full answer

High-Paying Jobs That Even AI Can’t Replace — Through JEE/NEET

🎯 Hear from the experts why preparing for JEE/NEET today sets you up for future-proof, high-income careers tomorrow.

An Intiative by Sri Chaitanya

Argon and calcium

Chlorine and calcium

Potassium and chlorine

Potassium and argon

answer is C.

(Unlock A.I Detailed Solution for FREE)

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

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.

Watch 3-min video & get full concept clarity

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test