Compounds
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Compounds

Fixed Ratios of Ions

Within that crystalline network of ions, the ratio of cations to anions remains constant. That ratio depends solely on the charges of the cations and anions. The ratio of the number of cations to anions will be just opposite the ratio of charges on the ions, so that the amount of positive and negative charge is equalized. Because the ratio of ions is fixed, ionic bonding results in the formation of compounds, which have fixed composition.
Ions Ca2+ with Cl-
Cl-
Charge
Ratio
2 to 1
Ion
Ratio
1 to 2
Formula CaCl2

 

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