The Periodic Table is an arrangement of elements in groups and periods.

1. (a)Describe how the position of an element in the Periodic Table is related to its electronic configuration.[2]
2. (b)Aluminium is an element in Group III of the Periodic Table. Deduce the electronic configuration of the aluminium ion.[1]
3. (c)Aluminium reacts with oxygen to form aluminium oxide, Al2O3.
4. (c)(i)Construct the equation for this reaction.[1]
5. (c)(ii)Aluminium oxide reacts with both acids and alkalis. Name the type of oxide which reacts with both acids and alkalis.[1]
6. (d)(i)Draw a ‘dot-and-cross' diagram of a molecule of oxygen. Only draw the outer shell electrons.[2]
7. (d)(ii)Describe and explain the difference in the rate of diffusion of the gases oxygen and nitrogen.[1]
8. (d)(iii)Oxygen reacts with hydrogen to form water. Sulfur reacts with hydrogen to form hydrogen sulfide. Some properties of hydrogen sulfide are listed. • It is a gas at room temperature. • It reacts with aqueous sodium hydroxide. • It is a reducing agent. • It burns in air. Describe four ways in which the properties of water differ from those of hydrogen sulfide.[2]

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