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प्रश्न
Complete the table below by identifying A, B, C, D, E and F.
उत्तर
| Element | Symbol | Number of protons |
Numbers of neutrons |
Number if electrons |
| Fluorine | `""_9F""^19` | 9 | `A` | `B` |
| Aluminium | `C` | `D` | `14` | `13` |
| Postassium | `""_19K""^39` | `E` | `F` | `19` |
ans
| Element | Symbol | Number of protons | Number of neutrons | Numbers if electrons |
| Fluorine | `""_9F""^19` | 9 | 10 | 9 |
| Aluminium | `""_13Al""^27` | 13 | 14 | 13 |
| Potassium | `""_19K""^39` | 19 | 20 | 19 |
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