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.