8.46 Write down the number of 3d electrons in each of the following ions: Ti2+, V2+ , Cr3+, Mn2+, Fe2+, Fe3+, Co2+, Ni2+ and Cu2+. Indicate how would you expect the five 3d orbitals to be occupied for these hydrated ions (octahedral).

8.46 S.no Ion Configuration Number of 3d electrons No. of unpaired Electrons 3d orbitals 1 Ti2+ 3d2 2 2 t22g e0g 2 V2+ 3d3 3 3 t32g e0 g 3 Cr3+ 3d3 3 3 t32g e0 g 4 Mn2+ 3d5 5 5 t32g e2 g 5 Fe2+ 3d6 6 4 t42g e2 g 6 Fe3+ 3d5 5 5 t32g e2 g 7 Co2+ 3d7 7 3 t52g e2 g 8 Ni2+ 3d8 8 2 t62g e2 g 9 Cu2+ 3d9 9 1 t62g e3g Note: In an octahedral field, the d-orbitals split into two sets of orbitals, the set of orbitals ( dxy, dyz, dxz) with lower energy is called t2g and the set of orbitals (dx2-y2 and dz2) with higher energy is called eg

8.46 Write down the number of 3d electrons in each of the following ions: Ti²⁺, V²⁺ , Cr³⁺, Mn²⁺, Fe²⁺, Fe³⁺, Co²⁺, Ni²⁺ and Cu²⁺. Indicate how would you expect the five 3d orbitals to be occupied for these hydrated ions (octahedral).

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Payal Gupta | Contributor-Level 10

8 months ago

8.46

S.no	Ion	Configuration	Number of 3d electrons	No. of unpaired Electrons	3d orbitals
1	Ti²⁺	3d²	2	2	^t22g e⁰g
2	V²⁺	3d³	3	3	^t32g e⁰ g
3	Cr³⁺	3d³	3	3	^t32g e⁰ g
4	Mn²⁺	3d⁵	5	5	^t32g e² g
5	Fe²⁺	3d⁶	6	4	^t42g e² g
6	Fe³⁺	3d⁵	5	5	^t32g e² g
7	Co²⁺	3d⁷	7	3	^t52g e² g

Ni²⁺

3d⁸

^t62g e² g

Cu²⁺

3d⁹

^t62g e³g

Note: In an octahedral field, the d-orbitals split into two sets of orbitals, the set of orbitals ( d_xy, d_yz, d_xz) with lower energy is called t_2g and the set of orbitals (d_x2-y2 and d_z2) with higher energy is called e_g