The graph below charts the first si x ionization energies of an unknown gaseous atom.(a) I...

The graph below charts the first si x ionization energies of an unknown gaseous atom.

(a) If this element is in the third period, what is its electron configuration?

(b) If this element is in the first row of transition metals, what is its electron configuration?

(c) For each of the elements in parts (a) and (b), explain why there is such a large gap between IE4 and IE5