Copper(I) is diamagnetic but copper(II) is paramagnetic-why?

Copper (I) is diamagnetic while copper (II) is paramagnetic . Explain.

Account the following Copper (I) is diamagnetic whereas copper (II) is paramagnetic

How would you account for the following ? (i) Copper (I) is diamagnetic, whereas copper (II) is paramegnetic. (ii) What is the common oxidation state of Cu, Ag Au ? (iii) The d^(1) configuration is very unstable in ions.

Cu^+ is diamagnetic , but Cu^2+ is paramagnetic . Why ?

Explain why Cu(I) is diamagnetic while Cu(II) is paramagnetic.