Giant covalent structures

1 mark · Normal

Which statement correctly compares the electrical conductivity of diamond, graphite, and C60 fullerene?

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Correct option: Only graphite conducts electricity because it has delocalised electrons.

Common mistakes: choosing 'all three conduct electricity'

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Marking points

B1 · 1 mark · Correct option selected: Only graphite conducts electricity because it has delocalised electrons.

Worked solution

Only graphite conducts electricity because it has delocalised electrons. In diamond, all the electrons are used in bonding; in C60 fullerene, electrons cannot move between molecules.