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Question
State the valency of the elements of periods 3 and write the formula of their oxides.
Solution
| Elements | Valency | Formula of oxides |
| Na | 1 | `Na_2O` |
| Mg | 2 | `MgO` |
| Al | 3 | `Al_2O_3` |
| Si | 4 | `SiO_2` |
| P | 5 | `P_2O_5` |
| S | 2 | `SO_2` |
| CI | 1 | `Cl_2O` |
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