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Chemistry 2.3 (metallic bonding (malleable (slide past each other),…
Chemistry 2.3
metallic bonding
involves delocalized electrons
consist of giant structures
strong electrostatic attraction
share negative electron
held together in regular structure
solid at room temp.
good conductors
malleable
slide past each other
alloys are harder than pure metals
allotropes of carbon
different structural forms of the same element in the same physical state
Diamond
giant covalent structure
four covalent bonds
very hard
strong covalent bonds
very high melting point
Graphite
three covalent bonds
sheets of carbon atoms arranged in hexagons
no bonds between layers
ideal for lubricating materials
high melting point
one delocalised electron so can conduct electricity
graphene
one layer of graphite
one atom thick
two dimensional compound
contains delocalized electrons
fullerenes
shape like closed tubes or hollow balls
arranged in hexagon
large surface area
great lubricants
could make great industrial catalysts