Formula of Ions

Which one is the correct formula for sodium ions?

• Na

• Na⁺

• Na²⁺

• Na^-

Which one is the correct formula for oxide ions?

• O²⁺

• O^-

• O^2-

• O^3-

Which one is the correct formula for iron(II) ions?

• Fe^2-

• Fe⁺

• Fe³⁺

• Fe²⁺

Which one is the correct formula for nitrate ions?

• NO₃^-

• NO₂^-

• NO₃^2-

• NO₃^-

Which one is the correct formula for hydroxide ions?

• OH⁺

• OH₂^-

• OH^-

• OH^2-

Which one is the correct formula for alumnium ions?

• Al^3-

• Al²⁺

• Al⁺

• Al³⁺

Which one is the correct formula for carbonate ions?

• CO₃^-

• CO₃^3-

• CO₂^2-

• CO₃^2-

Which one is the correct formula for silver ions?

• Ag^-

• Ag²⁺

• Ag⁺

• Ag³⁺

Which one is the correct formula for sulphate ions?

• SO₄^2-

• SO₄^-

• SO₃^2-

• SO₄^3-

Which one is the correct formula for ammonium ions?

• NH⁺

• NH₂⁺

• NH₃⁺

• NH₄⁺