S-Cool Revision Summary

S-Cool Revision Summary

Group II elements are less reactive than the Group I element in the same period. In compounds, the Group II elements always have an oxidation number of +2.

The ease with which an atom loses electrons increases with increasing atomic number in Group II.

The ease of thermal decomposition of Group II nitrates and carbonates decreases down the Group. Thermal decomposition is determined by the ability of the cation present to polarise the large carbonate or nitrate ions.

The solubility of Group II sulphates decreases down the Group. This trend is explained by the decrease in magnitude of the enthalpy change of hydration of M2+.

The metallic character of the elements in Group IV increases with atomic number and the non-metallic character decreases with atomic number.

The stability of the +4 oxidation state in Group IV decreases with increasing atomic number and the stability of the +2 oxidation state increases with increasing atomic number.

All the tetrachlorides of Group IV except carbon are readily hydrolysed by cold water to form the corresponding oxide and HCl.

The thermal stability of the Group IV tetrachlorides decreases with increasing atomic number.

The thermal stability of the group IV dioxides decreases with increasing atomic number of the Group IV element.