Common monatomic ions Helping students learn the chemical formula of a range of common ions. Simple drag and drop exercise. Drag Chemical Ions to their names Chloride Bromide Iodide Oxide Nitride Fluoride Sulfide Phosphide Nitride Hydrogen Aluminum Potassium Sodium Magnesium Calcium Cl- Br- I- O2- N3- F- S2- P3- N3- H+ Al3+ K+ Na+ Mg2+ Ca2+