Metalic structures Flashcards
1
Q
Describe the main features of metals in terms of their structure
A
Positive metal ions arranged in layers with delocalised electrons
2
Q
Explain why metals can conduct electricity
A
Delocalised electrons are free to carry charge
3
Q
Explain why pure metals are soft
A
Layers of metal ions are free to slide over each other
4
Q
What is an alloy?
A
A mixture of two or more elements, at least one of which is a metal
5
Q
Give a reason for alloying a metal
A
To make it harder, to make it less reactive
6
Q
Explain why alloys can be harder than pure metals
A
Different size of atoms disturb the layers to stop them sliding over each other
