Ionic & Metallic Bonding & Structure (Edexcel International A Level Chemistry)

Exam Questions

30 mins14 questions
1a6 marks

This question is about the elements in Period 3 of the Periodic Table, and some of their compounds.

The atomic radii of six of the elements are given.

Symbol Na Mg Al Si P S Cl Ar
Atomic
number
11 12 13 14 15 16 17 18
Atomic radius
/ nm
0.191 0.160 0.130     0.102 0.099  0.095

i)

Plot a graph of atomic radius against atomic number.

(2)

q22a-paper-1-june-2021-edexcel-ial-chemistry

ii)
Use the graph to estimate the atomic radius of silicon, Si.

(1)

iii)
Suggest an explanation for the decrease in atomic radius as atomic number increases across a period.
(3)
1b6 marks

The melting temperatures of sodium, sodium chloride and chlorine are given in the table.

Complete the table to show the type of structure, the type of bond or force broken on melting and the particles involved.

Substance Sodium Sodium chloride Chlorine
Melting temperature / °C 98 801 −101
Type of structure giant   simple molecular
Type of bond or force broken on melting      
Particles involved     chlorine molecules
1c4 marks

Solid phosphorus(V) chloride contains PCl4+ ions.

i)

Draw a dot-and-cross diagram of a PCl4+ ion.

Show only outer shell electrons.

(1)

ii)

Predict the shape of a PCl4+ ion.

Justify your answer.

(3)

Shape ............................................................................................

Justification

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