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TPR General Chem Passage 28 #3

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letsgoblue2015

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Which one of the following transition metal oxides is NOT colored?

A) CuO
B) FeO
C) TiO2
D) Mn2O3

Answer is C

The passage says transition elements show color because they have partially filled d orbitals. Therefore, I chose A because the d orbital exception makes Copper's d orbital fully filled.

Am I right or wrong here?
 

AureatEagle

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Which one of the following transition metal oxides is NOT colored?

A) CuO
B) FeO
C) TiO2
D) Mn2O3

Answer is C

The passage says transition elements show color because they have partially filled d orbitals. Therefore, I chose A because the d orbital exception makes Copper's d orbital fully filled.

Am I right or wrong here?

Copper in CuO is Cu2+, which means it's missing its 4s electrons. Thus, it cannot promote any electrons into a d orbital to make its d shell completely filled. Cu2+'s electron configuration, in other words, is [Ar]4s0, 3d9.
 

sakabato93

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The two 4s electrons are higher in energy than the 3d electrons, so they are transferred first. Now, d electrons begin transferring after all of the 4s electrons are gone. So for transition cations with 3+ charges, or higher, d electrons are involved, I believe.
 
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