Question
When do the layers start laying eggs?
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| Elements | Atomic number | Mass number | Protons | Electrons | neutrons | Electronic configuration | Valency |
| Chlorine | $17$ | ___ | ___ | ___ | $18$ | ___ | ___ |
| Silicon | ___ | $28$ | ___ | $14$ | ___ | ___ | ___ |
| Fluorine | ___ | ___ | $9$ | ___ | $10$ | ___ | ___ |