Three elements X, Y and Z belong to the third period of the modern periodic table and are placed in Group 1, Group 13 and Group 17, respectively. The chemical nature of the highest oxides of X, Y and Z, respectively, is

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Element X (Group 1, Period 3) is Sodium (Na). Being an alkali metal, its highest oxide Na₂O is strongly basic. Element Y (Group 13, Period 3) is Aluminium (Al). Its highest oxide Al₂O₃ reacts with both acids and bases, so it is amphoteric. Element Z (Group 17, Period 3) is Chlorine (Cl). Being a highly electronegative non-metal, its highest oxide Cl₂O₇ is strongly acidic. Thus, the nature of their highest oxides is Basic, Amphoteric, and Acidic, respectively. Answer: Basic, Amphoteric, Acidic