# Lewis structure of ions

In class, we learned about the Lewis structure of some elements such as carbon, but we didn't learn how to do the Lewis structure of cations and anions.

Do we just draw the number of electrons in the ion, or do we do something different?

So for example, what would be the Lewis structure of $\ce{Li+}$ and $\ce{Li-}$? How would you draw it out?

A positive charge of $X$ means $X$ electrons were lost, while a negative charge, $-Y$ means $Y$ electrons gained.
• @Nij Okay, this may be a somewhat different question, but what would the atom do if it had the same number of electrons added compared to electrons removed to get the $8$ valence electrons? For example, Carbon. It can add $4$ electrons to get $8$ valence electrons, or remove $4$ to get the same number of valence electrons as Helium. Which does it do? – Frank Sep 24 '16 at 3:09