C3.10 Giant metallic structure
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Why can metals be hammered and bend into different shapes?
➢ Because layers of atoms in pure metal are able to slide easily over each other
What are alloys?
➢Mixtures of metals of two or more elements, at least one of which is a metal
Why is steel harder than iron?
➢Contains a mixtures of metals ➢Carbon atoms are different sizes to the iron atoms ➢Makes it more difficult for them to slide over each other
Why can metals be hammered in shape without cracking?
➢Electron are able to move throughout the entire giant lattice ➢Because they move around - they can hold the metal ions together at the same time ➢When struck the metal atoms can slip past one other without breaking up
What does it mean if a metal is ductile?
➢It can be drawn out into wires
Why do metallic structures have high melting points?
➢The electrostatic forces of attraction extend in all directions ➢As the electrons move freely between the positive metal ions - “hence the sea of delocalised electrons” ➢Therefore takes a lot of energy to separate the metal ions from their fixed positions