Ionic Compounds and Their Formulas

What type of ions do metals typically form?

• Polyatomic ions

• Neutral ions

• Positive ions

• Negative ions

What is the valency of Group 1 elements?

• -1

• -2

• +2

• +1

Which group in the periodic table has elements with a valency of -3?

• Group 15

• Group 16

• Group 18

• Group 17

What is the charge of the ammonium ion?

• -2

• +1

• -1

• +2

Which of the following is a polyatomic ion with a -2 charge?

• Chlorate

• Phosphate

• Sulfate

• Ammonium

What is the principle for writing the formula of an ionic compound?

• The net charge should be zero

• The net charge should be negative

• The net charge should be positive

• The net charge should be equal to the number of atoms

How many chloride ions are needed to balance one calcium ion in calcium chloride?

• Three

• Two

• Four

• One

In the compound sodium sulfide, how many sodium ions are needed to balance one sulfide ion?

• Four

• One

• Two

• Three

What is the formula for calcium phosphate?

• Ca3(PO3)2

• Ca(PO4)2

• Ca2(PO4)3

• Ca3(PO4)2

What is the correct formula for tin(IV) sulfate?

• Sn2(SO3)4

• Sn(SO3)2

• Sn(SO4)2

• Sn2(SO4)4