la3+ रंगहीन है जबकि lu4+नारंगी लाल क्यों
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La3+ (Z=57) and Lu3+ (Z=71) do not show any coloured solution why?
La3+ ion has the configuration of xenon which is highly stable,Lu3+ also has the stable electronic configuration i.e. these completely filled valence orbital occur so they do not formed any colour ion or compounds.
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