How do you figure out the charge of an element that is located in the d-block of the periodic table?
It is difficult. look for ways for the element to achieve stability
Almost all d block elements have a possible charge of +2.
By losing the 2 s block elements a d block element can achieve more stability.
Also by losing the d block electrons, an element can achieve stability . group 3B can have a charge of +3 losing both s electrons and the 1 d electron
group 4 b can have a charge of + 4 losing both s electrons and the
2 d electrons, or just a charge of + 2 losing the s elections.
group 5 b can have a charge of + 5 losing both s electrons and the 2 d electrons or a charge of +2 losing the s electrons or + 3 losing the the d electrons.
With Iron "26" there are 6 d electrons. The half filled subshell is stable so the element will lose only the two s electrons +2 or the 2s electrons and the 1 "extra" d electron not needed for the half-filled subshell.
It is not always easy but think about how the element can achieve stability