MCQ
$Cu ^{2+}$ (Z = 29) का इलेक्ट्रॉनिक विन्यास है-
- A$\left[{ }_{18} A r\right] 3 d^8 4 s^1$
- B$\left[{ }_{18} A r\right] 3 d^7 4 s^2$
- ✓$\left[{ }_{18} A r\right] 3 d^9$
- D$\left[{ }_{18} A r\right] 3 d^6 4 s^2 4 p^1$
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