0.33 Polyatomic ions are ions which consist of more than one atom. For example, nitrate ion, NO 3 ;, contains one nitrogen atom and three oxygen atoms; sulphate ion SO 4 ^ -2 , contains one sulphur and four oxygen atoms. The atoms in a polyatomic ions are usually covalently bonded to one another, and therefore stay together as a single, charged unit. 3 (a) Write the chemical formula of element X having electronic configuration 28,2 with polyatomic ions given above. (6) Write two other polyatomic ions. (C) An element Y forms the compound with SO 4 ^ 2 having chemical formula Y 2 SO 4 Find out in which group element Y lies?
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