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Transcription of this question: The emission spectrum of an element can be used to identify it.(a)(b)(i) Draw the first four energy levels of a hydrogen atom on the axis, labellingn = 1, 2, 3 and 4.(ii) Draw the lines, on your diagram, that represent the electron transitions to n 2 Inthe emission spectrum.Elements show trends in their physical properties across the periodic table.(i) Outline why atomic radius decreases across period 3, sodium to chlorine.Outline why the ionic radius of is smaller than that of Cl-.[2](c)0)Copper is widely used as an electrical conductor.Draw arrows in the boxes to represent the electronic configuration of copper inthe 4s and 3d orbitals.4s3dImpure copper can be purified by electrolysis. In the electrolytic cell, impurecopper is the anode (positive electrode), pure copper is the cathode (negativeelectrode) and the electrolyte is copper(ll) sulfate solution.Formulate the half-equation at each electrode.Anode (positive electrode):Cathode (negative electrode):[2](iii) Outline where and in which direction the electrons flow during electrolysis.

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