Question: what are the properties of group 5 cations?
Answer: Group 5 cations are magnesium (II) Mg2+, potassium (I) K+ and sodium (I) Na+. These cations do not react with hydrochloric acid HCl, hydrogen sulphide H2S, ammonium sulphide and ammonium carbonate (NH4)2CO3. Magnesium does show similar reactions to IVth group cations; it forms basic magnesium carbonate MgCO3.Mg(OH)2.