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chemistry paper 1
metallic bonding
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Cards (8)
describe the structure of a pure metal
layers of
positive
ions surrounded by
delocalised
electrons
describe the bonding in a pure metal
strong electrostatic forces of attraction between
metal ions
and
delocalised
electrons
what are four properties of pure metals?
malleable
high
melting
and
boiling
point
good
conductors
of electricity
good conductors of
thermal
energy
why are pure metals malleable?
the
layers
can slide over each other easily
explain why metals have high melting and boiling points
the
electrostatic force
of attraction between positive metal ions and
delocalised electrons
is strong and requires a lot of energy to break
why are metals good conductors of electricity and thermal energy?
the
delocalised
electrons are free to move through the metal and therefore are able to carry the charge
what is an alloy?
a mixture of a
metal
with atoms of another element to harden a pure metal
why are alloys harder than pure metals?
the
different sized
atoms disturb the
layers
, preventing them from
sliding
over each other