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The dot structure of ##K_3N## is as shown in the figure below.
Potassium will lose its one valence electron and acquire one positive charge and therefore, there are no dots to be represented around it.
Nitrogen will gain three electrons from three potassium atoms to complete its octet at the outer shell acquiring a charge of three negative. We draw 8 dots around Nitrogen.
##K_3N## is an ionic compound so the bonds are ionic and are represented by the electrostatic attraction between the oppositely charged ions and therefore, it is not represented with dots like covalent bonds.
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