Examples for Valence-Shell Expansion Molecules Sulfur Hexafluoride SF6 SF6 has 48 valence electrons. Use 12 electrons to form the SF bonds and satisfy the octet-rule for fluorine (fluorine always follows the octet-rule). With this, we have used up 48 electrons, but sulfur has 12 electrons around it. Sulfur has empty 3d orbitals. The extra 4 electrons go into the formerly empty 3d orbitals.
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