Question

Which of the following are diamagnetic? (choose all that apply) Ca2+ 0 0 0 0 6 ส์ )

Answer 1

The correct options are Ca²⁺​​​​​​, Li⁺​​​​​​, Zn and S^2-.

EXPLANATION: Atoms or ions which have stable noble gas electronic configurations are always diamagnetic as they have all electrons paired. Ca²⁺, Li⁺​​​​​​ and S^2- are ions having stable noble gas electronic configurations. So, these ions are diamagnetic. The electronic configuration of Zn (Z = 30) is [Ar] 3d¹⁰4s² which shows that all the electrons are paired. Hence, Zn is also diamagnetic. The electronic configuration of C (Z=6) is 1s²2s²2p⁴. As the 2p orbitals in C are not fully filled, it has some unpaired electrons ( 2 unpaired) electrons. Therefore, C is paramagnetic.