The figure below shows some of the ions used in calculating the Madelung constant for NaCl. The Madelung constant is given by: α = 6- 12 + 8 6 24 + √2√3 2 √5 - The black circle in the center of the figure represents the reference sodium ion. Which ions contributed to the (-6/2) term in the series for a?
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Given: - Structure of NaCl crystal . with Na by small circles and Cl by big circles.
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