The complex ion which has no `""d""` electrons in the central atom is `(at. Cr=24, Mn=25, Fe=26,Co=27)`

The complex ion which has no.'d' electrons in the central metal atom is :

The complex ion which has no. ‘d’ electrons in the central metal atom is:

The complex which has no 'd' electrons in the central atom is (Atomic number, Cr= 24, Mn = 25, Fe = 26, Co = 27)