Properties of their compounds by periodic occurrence and properties of chlorides. Oxides of the elements in Period 2 and Period 3, as follows : 1. Because in the same period of metal (left), semi-metallic and non-metallic (right), each element has a valence electrons are not equal. Thus, the compound of the elements in the same period and, therefore, different compounds have different properties are mainly two. Metal, which is the right reaction with boron compounds in several species. Therefore, the oxidation many values. The metal, which is on the left. When reacting to a kind of non-metal compounds often have the same type. Therefore, the oxidation is only one of three. Chlorides and metal oxide compounds are ionic compounds except BeCl2 valence. It has a high melting point and boiling point The melting and boiling to dissolve Ionic bonding. The strong bonds The chlorides and oxides of non-metals. The valence compounds It has a low melting point and boiling point The melting and boiling destroys the bond between molecules. This is the van der Waals type forces London (molecular polarity) or the van der Waals-type attraction between positive and negative terminal of the molecule (a polar molecule) due to the van der Waals force that. Therefore, non-ferrous metals, soft, melting point, boiling point, low molecular weight molecules, except as P2O5, P2S5, PCl5 a relatively high melting point. For semi-metallic compound of the elements B and Si are relatively high boiling point, melting point, some B2O3, B2S3 Some are very high melting point, boiling point, including SiO2 because it is a lattice latticework. However, some species have a low melting point BCl3, SiCl4 4. compounds of trace metals to normal status as a solid, non-conductive, but when molten conductive. Because the ionic compound. The compounds of metallic elements are mainly gaseous or liquid state. Because the valence compounds 5. Solution of metal oxides Most of the properties are based (basic oxide) and oxides of non-metals are known to possess acid 6. Compounds of elements in Period 2 and Period 3, some insoluble include BeO, Al2O3, SiO2, BeS, CS2, P2S5, NCl3 and CCl4 7. SiO2 insoluble but have acidic because SiO2 solubility in alkaline solution. have
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