Mass of sodium is 23 amu, and the mass of chlorine is 34.6 amu. The center of the sodium ion is 12.00nm from the center of the chlorine ion.
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center of mass =
= ( 0*34.6 + 12.00*23) / (34.6 + 23)
= 4.79nm away from the center of chlorine ion
(OR 12 - 4.79 = 7.21nm away from the center of sodium ion)
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