What is a covalent bond?
2 marks · EasyCarbon dioxide (CO2) contains two double covalent bonds. How many shared electrons are present in the molecule in total?
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8 (±0)
Common mistakes: Counting 4 (just pairs not electrons); Forgetting each bond has 2 electrons
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Marking points
M1 · 1 mark · Works out that each double bond contains 4 shared electrons (2 pairs).
A1 · 1 mark · Gives correct total: 8 shared electrons in CO2.
Worked solution
There are 8 shared electrons in a molecule of CO2.