Periodic variation of the properties of oxides of the elements of the third period

Table
Periodic variation of the properties of oxides of the elements of the third period
group 1 group 2 group 13 group 14 group 15 group 16 group 17
reaction of oxides with water and the acid-base character of hydroxides Na2O gives NaOH (strong base) MgO gives
Mg(OH)2 (weak base) Al2O3 nonreacting SiO2 nonreacting P4O10 gives H3PO4 (weak acid) SO3 gives H2SO4 (strong acid) Cl2O7 gives HClO4 (strong acid)
bonding in oxides Na2O ionic MgO ionic Al2O3
ionic SiO2 covalent P4O10 covalent SO3 covalent Cl2O7 covalent
Source: From W. Robinson, J. Odom, and H. Holtzclaw, Jr., Chemistry: Concepts and Models, D.C. Heath and Co., 1992.
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