Lewis Structure is the pictorial representation of the arrangement of valence electrons around the individual atoms in the molecule. So, Sulphur Difluoride has a total of 20 valence electrons. Total number of valence electrons for SF 2 – 6 + 7*2 ( as there are two atoms of Fluorine, we will multiply the number by 2) Sulfur has six valence electrons in its outer shell. Total number of valence electrons for SF 2 – Valence electrons of Sulphur + Valence electrons of Fluorine So we will first find out the total valence electrons for Sulphur Difluoride. For drawing the Lewis structure for any molecule, we first need to know the total number of valence electrons.
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