Which is the best argument for why CaBr2 represents an ionic bond?
a
The difference in electronegativity of the two elements is greater than 1.7.
b
The difference in electronegativity of the two elements is less than 1.7.
c
The difference in electronegativity of the two elements is less than 1.7 but greater than 0.
d
The difference in electronegativity of the two elements is zero.