Problem: Add single electron dots and/or pairs of dots as appropriate to show the Lewis symbols of the following neutral atoms. Place electron dots as needed on each atom. Click either the single electron or lone pair buttons to add electrons.As, Se, Br, K, Ca, and GaTo draw Lewis symbols for atoms and ions and to balance Lewis structures for ionic compounds.The Lewis symbol for an atom or ion shows the valence electrons as dots around the symbol for the element. Consider the following examples:Dots may be placed on the four sides of a symbol (top, bottom, left, and right) in any order, but the maximum number of dots per side is two. Notice that in the correct configuration the number of unpaired dots is maximized.The Lewis symbol for an ionic compound shows the Lewis symbols for the component ions side by side, with coefficients to indicate the relative numbers of ions. The Lewis structure of Mg3N2 isIf you compare the Lewis symbols for neutral Mg and N to that of their ions, you'll notice that all the valence electrons from magnesium were transferred to nitrogen.

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Problem Details

Add single electron dots and/or pairs of dots as appropriate to show the Lewis symbols of the following neutral atoms. 

Place electron dots as needed on each atom. Click either the single electron or lone pair buttons to add electrons.

As, Se, Br, K, Ca, and Ga



To draw Lewis symbols for atoms and ions and to balance Lewis structures for ionic compounds.

The Lewis symbol for an atom or ion shows the valence electrons as dots around the symbol for the element. Consider the following examples:


Dots may be placed on the four sides of a symbol (top, bottom, left, and right) in any order, but the maximum number of dots per side is two. Notice that in the correct configuration the number of unpaired dots is maximized.

The Lewis symbol for an ionic compound shows the Lewis symbols for the component ions side by side, with coefficients to indicate the relative numbers of ions. The Lewis structure of Mg3N2 is

If you compare the Lewis symbols for neutral Mg and N to that of their ions, you'll notice that all the valence electrons from magnesium were transferred to nitrogen.


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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.