Why are most of the transition metal compounds are paramagnetic ?

Explanation

Most of the transition elements and their compounds are paramagnetic due to the presence of unpaired electrons in their d-subshelle.g. Iron
Electronic configuration of `""_(26) Fe`
`1 s^(2) 2s^(2)2p^(6) 3s^(2) 3p^(6) 3d^(6) 4s^(2)`