Fluoride-ion - correct answer F⁻
chloride-ion - correct answer Cl⁻
bromide-ion - correct answer Br⁻
jodide-ion - correct answer I⁻
oxide-ion - correct answer O²⁻
sulfide-ion - correct answer S²⁻
ammonium-ion - correct answer NH₄⁺
waterstofsulfide-ion - correct answer HS⁻
hydroxide-ion - correct answer OH⁻
nitriet-ion - correct answer NO₂⁻
nitraat-ion - correct answer NO₃⁻
Acetaat-ion - correct answer CH₃COO⁻