| तत्व | इलेक्ट्रॉनिक विन्यास $(K, L, M)$ | संयोजकता |
|---|---|---|
| फ्लोरीन $(9)$ | $2, 7$ | $1$ |
| एल्युमीनियम $(13)$ | $2, 8, 3$ | $3$ |
| आर्गन $(18)$ | $2, 8, 8$ | $0$ |
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