Why salts of Sc3+, Ti4+, V5+ are colourless?

1.	Why salts of Sc3+, Ti4+, V5+ are colourless?
Answer» i. Electronic configurations of Sc³⁺, Ti⁴⁺, V⁵⁺ are: Sc³⁺: [Ar] 3d⁰ ; Ti⁴⁺: [Ar] 3d⁰ ; V⁵+: [Ar] 3d⁰ ii. The ions Sc³⁺, Ti⁴⁺ and V⁵⁺ have completely empty d-orbitals i.e., no unpaired electrons are present. Thus, their salts are colourless, as d-d transitions are not possible.

Answer»

i. Electronic configurations of Sc³⁺, Ti⁴⁺, V⁵⁺ are:

Sc³⁺: [Ar] 3d⁰ ; Ti⁴⁺: [Ar] 3d⁰ ; V⁵+: [Ar] 3d⁰

ii. The ions Sc³⁺, Ti⁴⁺ and V⁵⁺ have completely empty d-orbitals i.e., no unpaired electrons are present. Thus, their salts are colourless, as d-d transitions are not possible.

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Why salts of Sc3+, Ti4+, V5+ are colourless?

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