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Question: i cannot figure out the final answer...

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I cannot figure out the final answer
Caesium chloride (CsCI), used in DNA separation and nuclear medicine, forms salt crystals built from the unit cells shown in the figure below. CI ions form the corners of a cube and a Cs ion is at the centre of the cube. The edge length of the cube, which is called the lattice constant, is 0.4 nm 0.4 nm Cst (a) What is the magnitude of the net force (in N) exerted on the cesium ion by its eight nearest Cl neighbours? (b) If the CI in the lower left corner is removed, what is the magnitude of the net force (in N) exerted on the cesium ion at the centre by the seven remaining nearest chlorine ions? 1.92 In what direction does this force act on the cesium ion? O away from the cormer with the removed CI O toward the corner with the removed Cl
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