Element Y is sulfur (Group VI) with liquid chloride and amphoteric oxide Steps: - Period 3 elements range from Na (Group I) to Ar (Group XVIII); identify those with liquid chlorides at room temperature (~25°C). - SiCl4 (Group IV) and PCl3 (Group V) are liquids, but S2Cl2 (Group VI) is also a liquid (melting point -80°C, boiling point 138°C). - Sulfur in Group VI forms S2Cl2 as the chloride that fits the description. - Sulfur's oxide (SO2) shows amphoteric properties, reacting with bases to form sulfites and exhibiting basic character in certain oxidizing acid environments. Why D is correct: - SO2 is amphoteric per oxide classification, dissolving in water to form H2SO3 (acidic behavior) and reacting with NaOH to form Na2SO3 (basic behavior), tied to the definition of amphoteric oxides reacting with both acids and bases. Why the others are wrong: - A: Group I (Na) oxide Na2O is basic, but NaCl is solid. - B: Group IV (Si) oxide SiO2 is acidic, not amphoteric, despite SiCl4 being liquid. - C: Group VI oxide SO2 is amphoteric, not purely acidic. …