It is very easy. Take a nitrogen atom at center. Draw 5 valence electrons around it (keep two of them in pairs). Now take 3 hydrogen atoms in front of every free electron. Draw the electron of each hydrogen atom. Click Here to see the diagram I have drawn using using MS Paint.
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To draw an electron dot diagram for ammonia (NH3), place one dot each around the nitrogen atom (N) and three dots around each hydrogen atom (H). This represents the valence electrons of each atom. Two electrons between N and each H represent the covalent bond of the molecule.
To draw an oxygen electron dot diagram, first write the symbol "O" in the center. Then, place one dot on each side of the symbol to represent the six valence electrons of an oxygen atom. Ensure that no more than two dots are placed on each side.
An electron dot diagram, also known as Lewis dot diagram, uses dots to represent the valence electrons of an atom.
The electron arrangement for silicon is 2-8-4, meaning that it has 2 electrons in the first energy level, 8 electrons in the second energy level, and 4 electrons in the third energy level.
The electron dot diagram for ammonia (NH3) shows nitrogen at the center with three lone pairs of electrons around it, and each hydrogen atom connected to the nitrogen atom with a single bond. This gives nitrogen a total of 8 valence electrons around it.
Chlorine has 7 dots in its electron dot diagram, representing its 7 valence electrons.