Which of the following shows the correct order of paramagnetism?

1. ​​N > Al > O > Ca
2. N > O > Al  > Ca
3. O > N > Al > Ca
4. O > N > Ca > Al

Aslso provide the reason.....

Dear Student

Greater the number of unpaired electrons greater will be the amount of paramagnetism.

(i) Electronic configuration nitrogen will be 1s₂2s₂2p₃ which means it has 3 unpaired electron.
(ii) ​Electronic configuration aluminium will be 3s₂3p₁ which means it has 1 unpaired electron.
(iii)​Electronic configuration oxygen will be 2s₂2p₄ which means it has 2 unpaired electron.
(iv) ​Electronic configuration calcium will be 4s₂ which means it has 0 unpaired electron.

Hence the correct ans is 2