Copper forms the hydrated complex, [ extCu( extH2 extO)6]2+. (i) Give the name of the complex ion and draw its shape. (ii) Give the formula of the complex ion formed when a solution of EDTA is added t

Here are the solutions to the questions: 4. (b) Copper forms the hydrated complex, [Cu(H_2O)_6]^2+ (i) Give the name of the complex ion and draw its shape: Name: Hexaaquacopper(II) ion Shape: Octahedral (A drawing would show a central Cu atom with six H_2O ligands arranged at the vertices of an octahedron, with the overall 2+ charge outside square brackets.) (ii) Give the formula of the complex ion formed when a solution of EDTA is added to a solution of [Cu(H_2O)_6]^2+ EDTA is a hexadentate ligand, meaning it can form six coordinate bonds to a central metal ion. It will replace all six water ligands. Formula: [Cu(EDTA)]^2- (iii) Using the s p d notation, write the electronic configuration of copper in the complex ion. In the complex ion [Cu(H_2O)_6]^2+, copper is in the +2 oxidation state (Cu^2+). Atomic number of Copper (Cu) is 29. Electronic configuration of neutral Cu: 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^1. To form Cu^2+, two electrons are removed: first from the 4s orbital, then from the 3d orbital. Electronic configuration of Cu^2+: 1s^2 2s^2 2p^6 3s^2 3p^6 3d^9 4. (c) Carbon, silicon, germanium, tin and lead are elements of Group IV (14) of the Periodic Table. (i) State the variation in structure of the elements carbon to lead. The elements of Group IV show a transition from giant covalent structures to giant metallic structures down the group. Carbon (diamond/graphite), silicon, and germanium have giant covalent structures. Tin and lead have giant metallic structures. (ii) Give the name or formula of a chloride of Group IV element that is A: covalent and decomposes readily at room temperature and pressure (r.t.p.). Name: Lead(IV) chloride Formula: PbCl_4 (Lead(IV) chloride is covalent but thermally unstable and decomposes readily at room temperature to PbCl_2 and Cl_2.) B: strongly reducing. *