Question

What will be total spin of Fe3+ ion? As its have 3 valence electrons ...spin shoud be 3 x 1/2 but ans. is 5x1/2...how is it possible.please give suitable explanation and common method to find total spin for ions?

Answer 1

Fe3+

that means atomic no. of atom = 26

when we will fill the electrons it will become like

1s(2) 2s(2) 2p(6) 3s(2) 3p(6) 3d(6) 4s(2)

now we know that it is Fe3+ thats y it will loose 3 electrons so the last valance shell will be 3d(5) as 2 electrons frm 4s and 1 from 3d are removed

and d subshell have 5 orbitals where each orbital should be singly occupied before getting paired so each 5 electrons in 3d will b left unpaired therefore they will be having spin of 5 x 1/2

ask if anythng is misunderstood by u or u arre not able to understand...
thnk u..

Answer 2

The total spin of $Fe_3^+$ ion will be 5x$\frac{1}{2}$

• The atomic number of the atom is 26.

• Thus the electronic configuration will be: 1s(2) 2s(2) 2p(6) 3s(2) 3p(6) 3d(6) 4s(2)

• We  know that,  $Fe_3^+$ will lose three electrons.

• Thus the last valence shell becomes 3d(5), as two electrons from the 4s and one from the 3d are lost.

• Also, each orbital in the d subshell should be singly occupied before being coupled, so each of the 5 electrons in 3d will be left unpaired.
• Thus the total spin of $Fe_3^+$ is 5x$\frac{1}{2}$.

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