| તત્વ | $K$ | $L$ | $M$ |
| $X_{11}$ | $2$ | $8$ | $1$ |
| $Y_{16}$ | $2$ | $8$ | $6$ |
| સંજ્ઞા | સંયોજકતા |
| $X$ | $+1$ |
| $Y$ | $-2$ |
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| બીજા આવર્તના તત્વો | $B$ | $Be$ | $O$ | $N$ | $Li$ | $F$ | $C$ |
| પરમાણ્વીય ત્રિજ્યા $(pm)$ | $88$ | $111$ | $66$ | $74$ | $152$ | $64$ | $77$ |
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