Question

Sc3+,Cu+ and Zn2+ are diamagnetic .give reason

Answer 1

Diamagnetic and paramagnetic properties depends on electronic configuration.

If atom or ions possesses unpaired electrons then atom or ion will be paramagnetic and if all electrons are paired ion or atom will diamagnetic.

In Cu+ electronic configuration is 3d10 and does not any unpaired electron but in Cu2+ electronic configuration of copper is 3d9 with 1 unpaired electron so it will be peramagnetics!