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| सूची-$I$ (तटस्थ परमाणु का इलेक्ट्रॉनिक विन्यास जहाँ $n=2$) | सूची-$II$ ($1^{st}$ आयनन ऊर्जा $\text{kJ mol}^{-1}$ में) |
| $A. ns^2$ | $I. 2080$ |
| $B. ns^2np^1$ | $II. 899$ |
| $C. ns^2np^3$ | $III. 800$ |
| $D. ns^2np^6$ | $IV. 1402$ |
| $A_{(g)} \to A^{+}_{(g)} + e^-, \ A_1$ | $B_{(g)} \to B^{+}_{(g)} + e^-, \ B_1$ |
| $B^{+}_{(g)} \to B^{2+}_{(g)} + e^-, \ B_2$ | $C_{(g)} \to C^{+}_{(g)} + e^-, \ C_1$ |
| $C^{+}_{(g)} \to C^{2+}_{(g)} + e^-, \ C_2$ | $C^{2+}_{(g)} \to C^{3+}_{(g)} + e^-, \ C_3$ |
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