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 are shown in Figure 6. Complete Figure 7 to show the electronic configurations and charges of the ions in lithium fluoride. Figure 7 Li charge on ion .............. F charge on ion ..............

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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 with Li

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Answer

In Figure 7, the lithium ion (Li+) should show:

The electronic configuration: 2 electrons in the first shell and 0 in the second shell. This indicates it has lost one electron, resulting in a positive charge.
Charge on ion: +1

Step 2

Complete Figure 7 with F

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Answer

For the fluorine ion (F-), the configuration should display:

The electronic configuration: 2 electrons in the first shell and 8 electrons in the second shell, showing it has gained one electron, resulting in a negative charge.
Charge on ion: -1

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