[Judy]

The iron in hemoglobin is _____when carrying oxygen to cells, and ____ after releasing the oxygen.

A) diamagnetic Fe2+, paramagnetic Fe3+
B) diamagnetic Fe2+, paramagnetic Fe2+
C) paramagnetic Fe2+, diamagnetic Fe3+
D) paramagnetic Fe3+ diamagnetic Fe3+
E) none of these
The answer is B

Can someone explain this, please? Thanks.

[Borek]

Apparently the electron configuration of the iron change between both forms of hemoglobin. Do they have the save number of unpaired electrons?