In the electron dot structure, the valence shell electron is represented by cross or dot.
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Solution
The above image is the electron dot structure representation for Cl2 molecule.
The atomic number of the chlorine atom is 17 and it has seven electrons in the outermost shell which are represented as dots in the electron dot structure.
Thus in the formation of Cl2 molecule sharing of the valence electron of chlorine atom takes place for completing their respective octets.