NH3, in this one the nitrogen will be the central atom. Nitrogen has five valence electrons with one pair of electrons and the other electrons are unpaired. Hydrogen has one unpaired valence electron in its higest main energy level 1s. Place the nitrogen in the middle and put a pair of dots on the top of it. Then, place the unpaired electrons on the other sides. Then, connect the hydrogen atoms to around the nitrogen atom in the remaining spots. The one electron in hydrogen will connect to the one unpaired nitrogen electron, thus making three single bonds in between the hydrogens and nitrogen.
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