1.

Whichis morestables? Fe^(3+)or Fe^(2+) - explain .

Answer»

Solution :`FE(Z=26)"" Fe to Fe^(2+)+2e^(-)`
`Fe to Fe^(3+) +3e^(-)`
`Fe^(2+)` [Number of electrons 24]
Electronic configuration `=[Ar]3D^(6)`
`Fe^(3+)` [Number of electrons 23]
Electronic configuration `=[Ar]3d^(5)`
Among `Fe^(3+) and Fe^(2+), Fe^(3+)` is more stable DUE to half filled d-orbital. This can be explained by Aufbau principle. Half filled and completely filled d-orbitals are more stable than partially filled d-orbitals. So `Fe^(3+)` is more stable than `Fe^(2+)`.


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