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SingaporeChemistry

The Periodic Table

3 dot points across 3 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How is the Periodic Table arranged, and how does an element's position relate to its electronic structure?

Describe the arrangement of elements in the Periodic Table by proton number into periods and groups, relate position to electronic configuration, and describe the metal to non-metal trend across a period
A focused answer to the O-Level Chemistry outcome on the Periodic Table. Arrangement by proton number into periods and groups, the link between position and electronic configuration, and the change from metals to non-metals across a period.
8 min answer →

How do the properties of the alkali metals and the halogens change down their groups, and why?

Describe the properties and trends of Group I (the alkali metals) and Group VII (the halogens), including reactivity trends down each group and displacement reactions of the halogens
A focused answer to the O-Level Chemistry outcome on Groups I and VII. Properties and reactivity trends of the alkali metals and the halogens, why reactivity increases down Group I and decreases down Group VII, and halogen displacement reactions.
9 min answer →

What makes the transition elements different from the main-group metals, and why are the noble gases so unreactive?

Describe the characteristic properties of the transition elements and contrast them with Group I metals, and explain the unreactivity and uses of the noble gases in terms of full outer shells
A focused answer to the O-Level Chemistry outcome on the transition elements and noble gases. The typical properties of transition metals contrasted with Group I, their use as catalysts and coloured compounds, and why the noble gases are unreactive.
8 min answer →