PPT Slide

• Ionic compounds are arrays of oppositely charged ions rather  than separate molecular units.

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• Need only an empirical formula, the relative numbers of  cations and anions in the compound.

• The compound is neutral, so the positive charges of the  cations must balance the negative charges of the anions.

Calcium bromide is composed of Ca2+ ions and Brñ ions.

Two Brñ ions balance each Ca 2+ and so the formula is CaBr2.

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