The Madelung Constant Is Given by the Infinite Sum $\alpha$ = 6 - 12/2^1/2 + 8/3^1/2 -

Multiple Choice

The Madelung constant is given by the infinite sum $\alpha$ = 6 - 12/2^1/2 + 8/3^1/2 - ....Which of the following statements is true?

A) The numerators in these terms are the number of nearest neighbors in the crystal.
B) The denominators in these terms are related to the distances to the nearest neighbors.
C) The Madelung constant is the constant of proportionality in the expression for the net attractive potential energy of an ion in a crystal.
D) The value of $\alpha$ depends on the geometry of the crystal.
E) All of these are correct.