The Luwis diagram is similar to the Bohr model as it is a simplified Bohr model, so let's take a Nitrogen atom, it has 5 valence electrons, 7 total elections but 5 valence. So to draw a Lewis diagram for a Nitrogen atom, you would just draw the Valence elections, without the rings,.
Now let's take a Nitride Ion, which is a nitride atom that gained 3 elections, so a nitride atom has 8 valence electrons,
if we were to draw a nitride ion with the 8 valences it would be an N with 8 dots around it,
and those dots being the Valence elections, now since it added 3 elections, it is now a negative 3 charge, and you would write an N with 8 dots around it, but because it is a negatively charged ion, it would have brackets with -3 outside it.
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