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कॉपर ( Cu ) का संभावित इलेक्ट्रॉनिक विन्यास `[Ar]3d^(9),4s^(2)` होना चाहिए जबकि इसका वास्तविक इलेक्ट्रॉनिक विन्यास `[Ar]3d^(10),4s^(1)` हैं । स्पष्ट करो ।

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पूर्ण भरी हुई उपकोश अधिक स्थाई होती है।

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