Problem: Which of the following correctly represent the placement of electrons around each atom? Drag each item to the appropriate Bin.

FREE Expert Solution

Recall that when becoming an ion, the element tries to achieve the configuration of the nearest noble gas.


For NaF:

Na (metal) + F (nonmetal) → ionic compound

For Na: The nearest noble gas is Ne and we can see that Na has 1 more electron than Ne. This means it needs to lose 1 electron to achieve a noble gas configuration and in doing so becomes Na+.

Na → Group 1A → 1 valence electrons 

Na+ → will lose the 1 valence electron

For F: The nearest noble gas is Ne and we can see that I has 1 less electron than Ne. It needs to gain 1 electron to become F.

F → Group 7A → 7 valence electrons 

F → will gain 1 electron → total of 8 electrons (represented by dots and enclosed in bracket)


The correct placement of electrons for NaF is:


For CaBr2:

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Problem Details

Which of the following correctly represent the placement of electrons around each atom? Drag each item to the appropriate Bin.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Lewis Dot Structure concept. You can view video lessons to learn Lewis Dot Structure. Or if you need more Lewis Dot Structure practice, you can also practice Lewis Dot Structure practice problems.