Give the IUPAC names of the compounds:

${\mathrm{Na}}_3\left[\mathrm{Co}{\left({\mathrm{NO}}_2\right)}_6\right]$

Give the IUPAC names of the compounds:

${\left[\mathrm{Co}{\left(\mathrm{en}\right)}_2\mathrm{Cl}\left({\mathrm{NO}}_2\right)\right]}^{+}$

Give the IUPAC names of the compounds:

${\left[\mathrm{Pt}\left({\mathrm{NH}}_3\right){\mathrm{Cl}}_5\right]}^{-}$