Cr have 6 unpaired electrons but Mn has 5 unpaired electrons.Then why does Mn exhibit Maximum oxidation state instead of Cr??
Cr has an electronic configuration 3d5 4s1 and it is 3d5 4s2 for Mn.
One 4s electron can be excited to the 4p orbital and this gives the atom 7 unpaired electrons and hence Mn exhibits more oxidation states than Cr.
One 4s electron can be excited to the 4p orbital and this gives the atom 7 unpaired electrons and hence Mn exhibits more oxidation states than Cr.