The Complete structures that has been done by adding electrons, in the form of dots is given in the image attached.
This is known to be the way that Scientist uses in showing chemical structures to stand for some key characteristics of the molecules.
Note that Lewis dot structures compose of a pair of electrons that is said to be shared by two atoms which is depicted by a line called a bond.
Conclusively, Unpaired valence electrons in this structure are shown by dots found externally on the atom known as lone pairs.
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