Question

Explain why the lanthanum salts are generally colourless

Answer 1

Answer:

As expected from periodic trends, lanthanum has the largest atomic radius of the lanthanides and the stable group 3 elements. ... In dilute sulfuric acid, lanthanum readily forms the aquated tripositive ion [La(H2O)9]3+: this is colorless in aqueous solution since La3+ has no f electrons.

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Answer 2

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As expected from periodic trends, lanthanum has the largest atomic radius of the lanthanides and the stable group 3 elements. ... In dilute sulfuric acid, lanthanum readily forms the aquated tripositive ion [La(H2O)9]3+: this is colorless in aqueous solution since La3+ has no f electrons.