3.3 - Chemical properties

3.3.1 - Discuss the similarities in chemical nature of elements in the same group. The following reactions should be covered: alkali metals (Li, Na and K) with water and with halogens (Cl₂ and Br₂) halogens (Cl₂, Br₂ and I₂) with halide ions (Cl-, Br- and I-) halide ions (Cl-, Br- and I-) with silver ions. Reactions of the halogens with alkali and confirmation of the silver halide by reaction with ammonia solution are not required.

3.3.2 Discuss the change in nature, from metallic to non-metallic, of the elements across period 3. Use the study of the period 3 oxides to illustrate, for example, the change from basic through amphoteric to acidic oxides and their reaction with water. Halides and hydrides are not required.

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