Calcium chloride
2 marks · HardState the charge on each ion and the number of electrons in the outer shell of each ion in lithium fluoride.
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Li+ : +1 charge, 2 electrons in outer shell; F- : -1 charge, 8 electrons in outer shell
Also accept: Li+ ion has charge +1 and 2 electrons in outer shell; F- ion has charge -1 and 8 electrons in outer shell
Common mistakes: Incorrect charges; Incorrect numbers of electrons
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Marking points
B1 · 1 mark · Correct charge and outer shell electrons given for lithium ion (Li+).
B2 · 1 mark · Correct charge and outer shell electrons given for fluoride ion (F-).
Worked solution
Li+ ion: charge is +1, and 2 electrons in outer shell.
F- ion: charge is -1, and 8 electrons in outer shell.