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GCSE Chemistry · key term
Two electrons shared between bonded atoms; one shared pair forms one covalent bond.
Used by Edexcel and OCR
Specification 1.28 · Paper 1, Paper 2
A pair of electrons associated with both bonded atoms rather than with only one of them.
Revise: Formation of Covalent BondsThe negatively charged bonding electrons are attracted to the positively charged nucleus of each atom. This strong electrostatic attraction between the shared pair of electrons and both nuclei holds the atoms together and is the covalent bond.
Specification C2.2d · Paper 1 (Foundation), Paper 3 (Higher)
A pair of outer-shell electrons shared between two atoms; one shared pair forms one covalent bond.
Revise: Simple Molecular SubstancesOne covalent bond contains a shared pair of electrons. It is not a material stick holding two atoms together. Its nature is a strong electrostatic attraction between the negatively charged shared pair and the positively charged nuclei of the two bonded atoms.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Do not define a covalent bond only as a shared pair of electrons. For a fuller explanation, state that the bond is the strong electrostatic attraction between the shared pair and the two nuclei.
When describing bonding, state what is attracted: a covalent bond is the strong electrostatic attraction between a shared pair of electrons and the nuclei of the bonded atoms.
When interpreting a model, explain what its symbols mean. For example, a line in a displayed formula represents one shared pair of electrons.
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