Ionic & Metallic Bonding & Structure (Edexcel International A Level (IAL) Chemistry): Exam Questions

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.

i) Plot a graph of atomic radius against atomic number.

(2)

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)

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.

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