The Period 3 elements show trends in physical and chemical properties across the period. Fig. 2.1 shows the variation in atomic and ionic radii of the Period 3 elements Na to Cl. The ionic radius of Si is not shown. [Figure 2.1]

1. (a)(i)Explain the trend shown in the atomic radii of the Period 3 elements Na to Cl.[2]
2. (a)(ii)Explain why there is a large difference in the ionic radii of Al and P.[2]
3. (b)Table 2.1 gives some information about some of the Period 3 oxides. Row B gives the pH of the solution that forms when the Period 3 oxide is added to water. [Table 2.1]
4. (b)(i)Complete Table 2.1.[2]
5. (b)(ii)State why there is no data given in row B for Al₂O₃ and SiO₂.[1]
6. (c)(i)Write an equation for the reaction of Na₂O with dilute hydrochloric acid.[1]
7. (c)(ii)Construct an equation for the reaction of Al₂O₃ with a base to form NaAlO₂.[1]
8. (d)Group 2 nitrates decompose on heating to form oxides.
9. (d)(i)State the trend in thermal stability of the Group 2 nitrates down the group.[1]
10. (d)(ii)Identify the other products of the thermal decomposition of Group 2 nitrates.[1]

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