Lithium fluoride, LiF, is an ionic compound - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2016 - Paper 1
Question 4
Lithium fluoride, LiF, is an ionic compound.
It contains lithium cations and fluoride anions.
The electronic configurations of a lithium atom and of a fluorine atom... show full transcript
Worked Solution & Example Answer:Lithium fluoride, LiF, is an ionic compound - Edexcel - GCSE Chemistry Combined Science - Question 4 - 2016 - Paper 1
Step 1
Complete Figure 7 - Lithium Ion
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Answer
For the lithium ion (Li⁺):
The electronic configuration will have lost one electron, thus it will show only 2 electrons in the inner shell.
The charge on the lithium ion is +1.
Step 2
Complete Figure 7 - Fluoride Ion
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Answer
For the fluoride ion (F⁻):
The electronic configuration will show an additional electron, leading to a total of 10 electrons around the nucleus, with 2 in the inner shell and 8 in the outer shell.
