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    1. Why is the electron configuration of chronium [AR] 3d5 4s1, isnt the 4s sub shell supposed to fill first?

    2. why is the formation of an Mn2+ ion favored over Mn3+?

    1. There is increased stability for half filled or completely filled d subshells so 3d5 4s1 is lower in energy than 3d4 4s2.

    2. What is Mn's outer electronic configuration? This is also to do with half-filled d subshells :yep:
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