Orbital diagram for Mo²⁺. What element is it isoelectric with?
This url has the shell structure as well a the orbtial electron struture @ webelements.com
https://www.webelements.com/molybdenum/
For the 2+ ion, remove 1 electron each from the 5s1 and 4d5 orbitals. The element iso-electic with the ion is 2 less electrons or 42-2 = 40 which I believe is Zr.