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what is metallic bonding?
the strong electrostatic attraction between negative delocalised electrons and positive metal ions
what is an alloy?
a mixture of 2 or more elements, one of which must be an atom
what is a delocalised electron?
an electron that is no longer tied to one particular atom and are free to move through the structure
what is a positive ion?
an atom that has lost one of more of its outer electrons
what does malleable mean?
a material that can be bent or hammered into shape
what does ductile mean?
a material that can be pulled into a wire
what is a metal lattice?
a giant metal structure consisting of positive metal ions surrounded by delocalised electrons
what is electrostatic attraction?
the attraction between positively charged and negatively charged particles
what is the structure like in metals?
giant structure, arranged in a regular pattern, outer shell of metal atoms are delocalised, free to move throughout the whole structure, strong electrostatic attraction forms strong metallic bonds
what are the properties of metals?
good conductor of electricity, good conductor of heat, high melting and boiling points
why are alloys harder than metals?
the mixture of different sized atoms in an alloy distort the layers in the giant metallic structure which make sit more difficult to for the layers to slide over each other so alloys are pure metals
what are the properties of copper?
good conductor of electricity, ductile, used for electrical wiring
what are the properties of steel?
construction, used for construction
what are the properties of gold?
malleable, resistant to corrosion, used for jewellery
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