Why are most of the transition metal compounds are paramagnetic ?

Explanation

Transition metal compounds are paramagnetic in nature due to the presence of unpaired electrons in d-subshell. More is the number of unpaired
electrons in a substance, greater is its paramagnetic character or magnetic moment `(mu)`
`mu_("eff") = sqrt(n (n +2)) BM`
where, n = number of unpaired electrons