Which of the following has the maximum number of unpaired electrons?
Fe2+
Mg2+=1s22s22p6 =no unpaired electron
Ti3+=1s22s22p63s23p63d1=one unpaired electron
V3+=1s22s22p63s23p63d2 =two unpaired electron
Fe2+=1s22s22p63s23p63d6 =four unpaired electron