Calcium chloride
1 mark · NormalWhich statement best describes the dot-and-cross diagram for calcium chloride (CaCl)?
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Correct option: The calcium atom transfers two electrons, one to each chlorine atom.
Common mistakes: Choosing option 1 (thinks electrons are shared, not transferred); Choosing option 3 (reverses direction of electron transfer)
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Marking points
A1 · 1 mark · Correctly identifies that calcium transfers two electrons, one to each chlorine atom.
Worked solution
The correct answer is: The calcium atom transfers two electrons, one to each chlorine atom.
In CaCl, calcium loses 2 electrons (1 to each chlorine) and forms a Ca ion, while each chlorine becomes a Cl ion.