What is a covalent bond?
1 mark · EasyDraw a dot-and-cross diagram to show a single covalent bond between two bromine atoms in a Br2 molecule.
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Dot-and-cross diagram for Br2, with each Br having 7 outer electrons (6 as lone pairs, 1 as a shared pair).
Must show: Each Br shows 7 outer electrons, A single shared pair between the atoms
Common mistakes: Not showing lone pairs; Wrong shared electron count
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Marking points
B1 · 1 mark · Diagram correctly shows each Br atom with 7 outer electrons, one shared pair between atoms.
Worked solution
Each Br atom has 7 electrons in its outer shell. One electron from each atom is shared as a pair between the two Br atoms.