Consider a metal ion with the outer electron configuration of d^4. In a coordination complex, the number of unpaired electrons in that metal ion depends on the orientation and type of ligands that surround it. Classify each description of a complex by the number of unpaired electrons in the d^4 metal ion.

a) 0

b) 4

c) 4

d) 4

e) 2

f) 4

Explanation:                                                                  No. unpaired electrons:

a) square planar, strong field                                                      

        d⁴                                                                                                 0

b) tetrahedral, strong field

        d⁴                                                                                                   4                                                      

c) Octahedral, weak field

       d⁴                                                                                                    4

d) square planar, weak field

      d⁴                                                                                                      4

e) Octahedral, strong field

      d⁴                                                                                                      2

f) tetrahedral, weak field

     d⁴                                                                                                       4

n has four pairs of electrons in the valence shell, electrons repel one another ,n has 7 protons in its nucleus, and since n has 7 protons, it must fill the second shell, giving it 4 pairs of electrons. the electrons form 3 bonds and 1 lone pair of electrons. each pair of electrons repels the other pairs, so they are equally far apart.

so all of the above

answer is a

explanation: