Step 1: Sulfur (EN = 2.5) is less electronegative than oxygen (EN = 3.5) so S is the central atom.
Step 2: The total number of valence electrons:
Group Valence Electrons
S 6A 1 × 6 e– = 6 e–
O 6A 3 × 6 e– = 18 e–
Total: 24 valence e–
Determine the electron geometry (eg), molecular geometry (mg), and polarity of SO3.
a) eg= trigonal bipyramidal, mg=trigonal planar, polar
b) eg=trigonal planar, mg=trigonal planar, nonpolar
c) eg=tetrahedral, mg=trigonal pyramidal, polar
d) eg=trigonal pyramidal, mg=bent, nonpolar
e) eg=tetrahedral, mg=tetrahedral, nonpolar
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