| परमाणु | परमाणु संख्या | द्रव्यमान संख्या | संयोजकता |
|---|---|---|---|
| $X$ | $5$ | $11$ | $3$ |
| $Y$ | $8$ | $18$ | $2$ |
| $Z$ | $15$ | $31$ | $3$ |
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