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`Zn^(2+)` लवण सफेद होते है, जबकि `Cu^(2+)` के लवण नील होते है, क्यों ?

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`Zn^(2+)` का इलेक्ट्रॉनिक विन्यास `3d^(10)` है | जिसमे d-उपकोश पूर्ण है, जिसके कारण यह रंगहीन अर्थात सफेद है | जबकि `Cu^(2+)` का इलेक्ट्रॉनिक विन्यास `3d^(9)` है | जिसमे d-उपकोश अपूर्ण है, जिसके कारण यह रंगहीन अर्थात नील रंग का होता है |

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