Question

Explain why:
$C{u}^{+}$ is diamagnetic but $C{u}^{2+}$ is paramagnetic. $(Z=29)$

Answer 1

$C{u}^{+}$ is diamagnetic because it has no unpaired electrons in its core.
On the other hand $C{u}^{++}$ is paramagnetic because it has an unpaired electron in its core.