Lewis dot structures are diagrams that show the bonding between atoms of a molecule, as well as lone pairs of electrons that may exist in the molecule.
First, we have to find out how many valence electrons are in the molecule.
Then, draw a skeletal molecule in which the central atom forms a single bond with each of the other atoms. The least electronegative element will make up the center atom.
Now, fill the octet of the most electronegative element and then the other elements.
Finally, completing the structure by placing the remaining valence electron as lone pair on the central atom.
Lewis dot structure of :
Total valence electrons in = Valence electron of Sulfur Valence electron of oxygen
Valence electrons
There is a charge on Sulfate ion which contributes to valence electrons.
Sulfur is the central atom and four oxygen atoms are located around the sulfur atom
Adding electron pair between Sulfur and oxygen to represent a chemical bond.
Now, completing octet of Oxygen i.e. electrons around each oxygen.
There are no electrons left from the valence electrons.
There are two bonds and two bonds in the Sulfate ion Lewis structure.
Lewis Dot Structure of :
Total valence electrons= Valence electron of Nitrogen Valence electron of Oxygen
Valence electrons=
Due to one negative charge, one electron will be added.
In the Lewis dot structure for Nitrate ion Nitrogen atom is the least electronegative atom and goes at the center of the structure surrounded by two oxygen atoms.
Placing one electron pair to show the chemical bond between each Nitrogen and Oxygen. Now we are left with valence electron
Assigning the electrons such that the octet of nitrogen and oxygen is completed.
Therefore, From the octet rule, we can draw the Lewis dot structures.