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| तत्व | $n_{(p)}$ | $n_{(n)}$ |
| तत्व | प्रोटॉन,न्यूट्रॉन,इलेक्ट्रॉन |
| $A$ | $9, 10, 9$ |
| $B$ | $16, 16, 16$ |
| $C$ | $12, 12, 12$ |
| $D$ | $17, 22, 17$ |
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