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प्रश्न
What valencies will be shown by the elements A, B, C, D and E having atomic number 2, 4, 8, 10 and 13 respectively.
टिप्पणी लिखिए
उत्तर
| Elements | Atomic no. | No. of protons | Electronic configuration | Valence electrons | valency |
| A | 2 | 2 | 2 | 2 | 0 |
| B | 4 | 4 | 2, 2 | 2 | 2 |
| C | 8 | 8 | 2, 6 | 6 | 2 |
| D | 10 | 10 | 2, 8 | 8 | 0 |
| E | 13 | 13 | 2, 8, 3 | 3 | 3 |
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