The surface of an ideal molecule of table salt (NaCl) is a square with a chemical structure as shown in the figure. The blue spheres represent Na+ ions and the green spheres represent Cl− ions. Consider only points A, B, C, and D. What is the magnitude of the net electrostatic force on the chlorine ion at point A due to the sodium ions at points B and C? Note: the bond length is 0.282 nm. (N)

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