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## SeF4 Lewis Structure, Geometry, and Polarity
Lewis Structure:
1. Count valence electrons: Se (6) + 4F (7 each) = 34 valence electrons
2. Central atom: Se (less electronegative)
3. Single bonds: Connect Se to each F with single bonds (8 electrons used)
4. Remaining electrons: 26 electrons remain. Place them as lone pairs around the F atoms (6 electrons each), leaving 2 electrons on the Se atom.
5. Formal charges: To minimize formal charge, move one lone pair from an F atom to form a double bond with Se.
Resulting Lewis structure: Se has two lone pairs, two single bonds, and one double bond.
Molecular Geometry: See-saw
Electron Geometry: Trigonal bipyramidal
Hybridization: sp³d
Polarity: Polar (due to the lone pairs and the unequal distribution of electron density)