Question 10

This question is about bonding, structures and properties.

The box gives four types of structure:

[ giant covalent | giant ionic | giant metallic | simple molecular ]

The table shows some properties of four substances, P, Q, R and S. Complete the table by giving the correct type of structure for each substance. You may use each structure once, more than once or not at all.

Substance	Electrical conductivity of solid	Electrical conductivity of liquid	Melting point
P	good	good	high
Q	poor	poor	high
R	poor	good	high
S	poor	poor	low

Lithium oxide ( $Li2O\text{Li}_2\text{O}$ ) is an ionic compound. Lithium has an electronic configuration of 2,1 and oxygen has an electronic configuration of 2,6. Describe how lithium atoms and oxygen atoms form lithium ions and oxide ions.

Describe the electronic configuration and charge of each of the ions in lithium oxide.

A molecule of carbon dioxide ( $CO2\text{CO}_2$ ) contains double covalent bonds. Describe the arrangement of the outer shell electrons in a molecule of carbon dioxide.

Aluminium ( $Al\text{Al}$ ) is a metal in Group 3 of the Periodic Table. Describe the structure and bonding in aluminium.

Explain why aluminium is malleable.