[stev3n]

[Ar], Ca2+
[Ar]3d5, Fe3+
[Ne]3s2, Mg2+
[Ar]4d5, Fe3+
[Ar]3d10, Zn2+

Compare the symbol to the electron configuration for each pair and label each pair as correct or incorrect.

Ca2+  would go to Ar - correct
3d5 is Mn, Fe3+ is V - incorrect
3s2 would go to Mg, Mg2+ would go to Ne - incorrect
[Ar]4d5 isn't even valid? but 4d5 would be Tc, Fe3+ is v - incorrect
3d10 is Zn, Zn2+ is Ni - incorrect

Am I doing this completely wrong? I guess I am since my online work is telling me so.

[Hello12]

The only questions that seem to be correct are 1, 2 and 5. 3d10 is Zn2+ because taking 2 electrons away from Zn would result in [Ar]3d10 being left. 3d5 is Fe3+ because taking 3 electrons away from 4s2 and 3d6 results with you being left with [Ar]3d5. Transition metals lose their electrons from the 4s shell first instead of the 3d.
hope this helps