Step 1: Carbon (EN = 2.55) is less electronegative than fluorine (EN = 3.98) so carbon is the central atoms.
Step 2: The total number of valence electrons present in C2F4 is:
Group Valence Electrons
C 4A 2 × 4 e– = 8 e–
F. 7A 4 × 7 e– = 28 e–
Total: 36 valence e–
Step 3: The bonding preferences of each element in the molecule is as follows:
• Carbon: prefers to form 4 bonds
• Fluorine: prefers to form 1 bond (when not the central atom)
The two C atoms will go in the center while F is a terminal atom.
Let’s first connect each atom while following their bonding preferences:
Draw a Lewis structure for
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