Calcium chloride
2 marks · EasyHow many electrons are present in the outer shell of a lithium atom and a fluorine atom before they react to form lithium fluoride? Give your answers as two numbers separated by a comma.
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1, 7
Also accept: Li: 1, F: 7; 1 and 7; lithium: 1; fluorine: 7
Common mistakes: 2,7; 7,1
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Marking points
B1 · 1 mark · States lithium atom has 1 electron in its outer shell.
B1 · 1 mark · States fluorine atom has 7 electrons in its outer shell.
Worked solution
A lithium atom has 1 electron in its outer shell. A fluorine atom has 7 electrons in its outer shell. Answer: 1, 7