1a1 mark
The elements across Period 3 show patterns in their chemical and physical properties.
State the trend in the atomic radius of successive elements in Period 3.
1b4 marks
The electrical conductivity of the elements in Period 3 varies across the period as shown in Fig. 1.1.
Fig. 1.1
i)
Explain why aluminium has a much higher electrical conductivity than sulfur. You should refer to the structure of both elements.
[2]
ii)
Explain why aluminium has a higher electrical conductivity than magnesium.
[2]
1c6 marks
The melting points of three successive elements in Period 3 are shown in Table 1.1.
Table 1.1
| Element | Melting point / °C |
| Aluminium | 660 |
| Silicon | 1410 |
| Phosphorous | 44 |
i)
Explain, referring to its structure and bonding, why the melting point of silicon is high.
[3]
ii)
Explain, referring to its structure and bonding, why the melting point of phosphorus is low.
[3]
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