Formula Writing Only Ionic Compounds

Na ⁺  and  S ^-2

• Na₂S
• NaS₂
• Na₂S₂
• NaS

The chemical formula for an ionic compound of potassium and oxygen is

• KO.
• K₂O.
• K₂O₂.
• KO₂.

What is the formula for magnesium phosphide?

• Mg₃P₂
• Mg₂P₃
• Mg₂PO₃
• Mg₃(PO₃)₂

What is the formula for aluminum fluoride?

• AlF
• Al₂F₃
• AlF₃
• Al₃F₂

What is the charge on the simple (single atom) ion that sulfur forms?

• 1-
• 2+
• 3+
• 2-

What is the formula for the compound formed by magnesium ions and nitrogen ions?

• MgN
• Mg₂N₃
• Mg₃N₂
• MgN₃

What is the element/ion symbol for Iron(III)?

• Fe
• Fe³⁺
• Fe^3-
• Fe(III)

The chemical formula for tin (IV) oxide is written

• Sn₂O₄
• Ti₂O₄
• SnO₂
• TiO₂

A negatively-charged ion.

• atom
• cation
• anion
• electron

Cations are

• positive
• negative
• on the right side of the periodic table.
• nonmetals