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The d-and f-Block Elements
write down the number of 3d electrons in each of t...

Question:
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).

Answer:

Metal ion
Number of d-electrons

Filling of d-orbitals

Ti²⁺ 2 t²_2g

V²⁺ 3 t³_2g

Cr³⁺ 3 t³_2g

Mn²⁺ 5 t³_2g e²_g

Fe²⁺ 6 t⁴_2g e²_g

Fe³⁺ 5 t^₃_2g e^₂_g

CO²⁺ 7 t^₅_2g e²_g

Ni²⁺ 8 t⁶_2g e^₂_g

Cu²⁺ 9 t⁶_2g e³_g

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Question:
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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Metal ion	Number of d-electrons	Filling of d-orbitals
Ti²⁺	2	t²_2g
V²⁺	3	t³_2g
Cr³⁺	3	t³_2g
Mn²⁺	5	t³_2g e²_g
Fe²⁺	6	t⁴_2g e²_g
Fe³⁺	5	t^₃_2g e^₂_g
CO²⁺	7	t^₅_2g e²_g
Ni²⁺	8	t⁶_2g e^₂_g
Cu²⁺	9	t⁶_2g e³_g

Question: 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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Question:
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).