Among the following ions which one has the highest paramagnetism?

[Cr(H2​O)6​]3+The oxidation number of Cr is +3Atomic number = 24Cr = [Ar]3d54s1Cr3+=[Ar]3d34s0There are three unpaired electrons. [Fe(H2​O)6​]2+The oxidation number of Fe is +2.Atomic number = 26Fe = [Ar]3d64s2Fe2+=[Ar]3d64s0There are four unpaired electrons [Cu(H2​O)6​]2+The oxidation number of Cu is +2.Atomic number = 29Cu = [Ar]3d104s1Cu2+=[Ar]3d94s0There is one unpaired electron. [Zn(H2​O)6​]2+The oxidation number of Zn is + 2.Atomic number = 30Zn = [Ar]3d104s2Zn2+=[Ar]3d104s0 There are no unpaired electrons.[Fe(H2​O)6​]2+ has the maximum number of unpaired electrons; therefore, the highest degree of paramagnetism.