Write the formula for a complex formed between co3 and nh3, with a coordination number of 6.

In complex compounds coordination number is the number of atoms or polyatomic ions surrounding the central metal. In given statement the coordination number given is 6, means there are 6 ligands surrounding the metal atom, and the ligands given are only NH₃, so 6 NH₃ molecules are surrounding the Cobalt atom. Hence,

                                              [Co (NH₃)₆]
As, NH₃ is neutral so the charge on sphere will be the charge on Co, as charge given in statement id +3 so,

                                               [Co (NH₃)₆]³⁺

Name of this complex is as follow,

                                    Hexaamminecobalt (III) Ion