Calcium chloride
2 marks · NormalLithium fluoride forms when lithium reacts with fluorine. Draw a dot-and-cross diagram to show the ions present in lithium fluoride after the ionic bond has formed.
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Must show: Li^+ ion shown with 2 electrons; F^- ion shown with 8 electrons in outer shell, Different symbols for electrons from Li and F, Charges labelled on each ion
Also accept: Electrons as any two distinguishable marks (e.g. circles vs dots), as long as source is clear
Common mistakes: Forgetting to label charges; Incorrect number of electrons
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Marking points
D1 · 1 mark · Diagram shows Li^+ ion with correct electrons and F^- ion with correct electrons
D2 · 1 mark · Correct use of dot and cross (or distinguishable) symbols, charges shown
Worked solution