The possible electron pair and molecular geometries are:
Draw the Lewis structure for SeF4.
Step 1: Selenium (EN = 2.4) is less electronegative than fluorine (EN = 4) so Se is the central atom.
Step 2: The total number of valence electrons present in the molecule is:
Group Valence Electrons
Se 6A 1 × 6 e– = 6 e–
F 7A 4 × 7 e– = 28 e–
Total: 34 valence e–
Step 3: Note that halogens, when not the central atom, forms only 1 bond.
The Lewis structure of SeF4 is:
Determine the molecular geometry of SeF4.
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