What valencies will be shown by the elements A, B, C, D and E having atomic number 2, 4, 8, 10 and 13 respectively.
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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