O-LevelChemistryBonding & Structure5070/11 · May/June 2019 · Q71 Mark
Which diagram shows the outer electron arrangement in calcium fluoride?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
ADiagram showing covalent bonding where calcium shares one electron pair with each of two fluorine atoms.
BDiagram showing covalent bonding where calcium shares two electron pairs with each of two fluorine atoms.
CDiagram showing ionic bonding with Ca²⁺ and two F⁻ ions, where calcium has lost two electrons (represented by dots) and each fluorine has gained one electron (dot) from calcium, completing its octet (represented by crosses).
DDiagram showing ionic bonding with Ca²⁻ and two F⁻ ions, where calcium has gained two electrons.
✓ Correct answer
C: Diagram showing ionic bonding with Ca²⁺ and two F⁻ ions, where calcium has lost two electrons (represented by dots) and each fluorine has gained one electron (dot) from calcium, completing its octet (represented by crosses).
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