Question

Crystal structures with ions must have ____________.

a. a 2+ charge
b. a negative charge
c. electrical neutrality
d. a positive charge

Answer 1

Crystal structures with ions must have c. electrical neutrality.
There are positive cations and negative anions in crystal structures, there can be more cations or anions, but summ of positive and negative charges in crystal structures are equal.
For example BaCl₂, barium cation is 2+ and chlorine anions are 1- (2-).