Question

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which statements about formula units and the composition of ionic compounds are true?
the overall charge of a formula unit is zero.
an ionic compound is made up of molecules called formula units.
a formula unit may have a positive, negative, or neutral charge depending on the ions involved.
the chemical formula for an ionic compound represents a formula unit
the formula unit represents the simplest ratio of the ions in an ionic compound

Explanation:

• A formula unit is the neutral combination of ions in an ionic compound, so its overall charge is zero.
• Ionic compounds do not consist of molecules; they are extended lattices of ions, so formula units are not molecules.
• Formula units are always neutral, as they balance positive and negative ion charges.
• The chemical formula of an ionic compound directly corresponds to its formula unit.
• By definition, a formula unit is the simplest whole-number ratio of ions in an ionic compound.

Answer:

• The overall charge of a formula unit is zero.
• The chemical formula for an ionic compound represents a formula unit.
• The formula unit represents the simplest ratio of the ions in an ionic compound.