Step 1: Arsenic (EN = 2.18) is less electronegative than fluorine (EN = 3.98) so arsenic is the central atom.
Step 2: The total number of valence electrons present in AsF3is:
Group Valence Electrons
As 5A 1 × 5 e– = 5 e–
F 7A 3 × 7 e– = 21 e–
Total: 26 valence e–
Step 3: The Lewis structure is:
Predict which molecules are polar. Select all that apply.
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