Ionic compounds

How do the following two elements bond together?
Na¹⁺  F^1-         

• NaF
• NaF₃
• Na₃F
• Na₁F₂

How do the following two elements bond together?
Cr³⁺  O^2-         

• CrO
• Cr₃O₂
• Cr₂O₃
• CrO₃

The proper formula for magnesium hydroxide:

• MgOH
• Mg₂OH
• Mg(OH)₂
• Mg₂OH₂

Name the following ionic compound: Cr(NO₂)₃

• chromium nitrite
• chromium nitride
• chromium III nitride
• chromium III nitrite

AgF

• silver fluoride
• silver fluorine
• monosilver monofluoride
• silver monofluorine

How do the following two elements bond together?
Al³⁺  O^2-         

• AlO
• Al₂O₃
• Al₃O₆
• Al₃O₂

Name the following ionic compound: LiNO₃

• lithium nitrate
• lithium III nitrate
• lithium nitride
• lithium oxide

What is the formula for copper(I) sulfate?

• CuSO₃
• CuSO4
• Cu₂SO₃
• Cu₂SO4