Sulfur hexafluoride Lewis Structure

Sulfur hexafluoride Lewis Structure: F₆S Lewis Structure, octahedral Geometry, sp3d2 Hybridization & Polarity

Sulfur hexafluoride Key Facts

The Sulfur hexafluoride Lewis structure is S–F single bond, S–F single bond, S–F single bond, S–F single bond, S–F single bond and S–F single bond; the central S has 6 electron domains (0 lone pairs), giving a octahedral electron-domain arrangement and a octahedral molecular geometry with a 90° bond angle. S is best described as sp3d2-hybridized, and Sulfur hexafluoride is nonpolar because the bond dipoles cancel by molecular symmetry.

Figure 1: Lewis Structure of Sulfur hexafluoride (F₆S)

Chemical Formula	F₆S
CAS Number	2551-62-4
Total Valence Electrons	48
Lewis Structure	S–F single bond, S–F single bond, S–F single bond, S–F single bond, S–F single bond and S–F single bond
Electron-Domain Geometry	octahedral
Molecular Geometry	octahedral
Hybridization Model	sp3d2 (central S)
Bond Angle	90°
Polarity	Nonpolar molecule

PubChem (CID 17358) and NIST list Sulfur hexafluoride as F ₆S with CAS 2551-62-4; molecular weight ≈ 146.06 g/mol. View CAS 2551-62-4 dictionary details on Guidechem →

Applications of Sulfur hexafluoride (CAS 2551-62-4)

Sulfur hexafluoride is encountered as a reagent, intermediate or specialty chemical in inorganic, organometallic and materials synthesis. Confirm grade, purity and supplier documentation (SDS) before specifying for a process.

Reagent / Intermediate Used in synthesis and formulation where the substance's reactivity is required.

Specialty Chemical Specified by grade for the intended process or research use.

Sourcing Verify purity, package and regional availability via the CAS identifier.

Procurement Note "Sulfur hexafluoride" is supplied in multiple commercial grades and package sizes. Specify purity, grade, moisture/impurity limits, package (cylinder, drum or bulk) and intended process, and use CAS 2551-62-4 as the primary identifier when screening suppliers; always confirm regional availability and safety documentation (SDS).

Step 1 - Valence Electrons & Central Atom

To draw the Sulfur hexafluoride Lewis structure we first count the total valence electrons. F₆S contains 6×7 (F) + 6 (S); the net charge of 0 gives a total of 48 valence electrons to place.

The central atom is S. It is the least electronegative atom capable of forming multiple bonds and is surrounded by the more electronegative terminal atom(s); hydrogen, when present, always occupies a terminal position. Electronegativity considerations place the electron density toward the terminal atom(s).

Valence-electron count

Total valence electrons = 6×7 (F) + 6 (S) = 48 electrons.

Step 2 - Lewis Structure & Electron Distribution

Place S at the center and connect each surrounding atom with a single bond, complete octets on the terminal atoms, and place any remaining electrons on the central atom. The resulting electron distribution is: S–F single bond, S–F single bond, S–F single bond, S–F single bond, S–F single bond and S–F single bond; no lone pairs on S.

Counting bonding and nonbonding electrons around S therefore satisfies the octet/expanded-octet requirement for the drawn structure.

S–F S–F S–F S–F S–F S–F

S: 0 lone pairs, 6 bonding domains

6 bonding domains + 0 lone pairs = 6 electron domains

Expanded Octet: d-Orbital Participation Central S belongs to period 3 or below, so it can accommodate more than eight electrons: low-lying d orbitals become available and the octahedral arrangement with 6 domains reflects this expanded valence shell. The octet rule alone does not apply to such hypervalent species.

Step 3 - VSEPR Theory & Geometry

VSEPR theory states that the 6 electron domains around S arrange to minimize mutual repulsion, giving an octahedral electron-domain geometry.

Because 0 of these domains are lone pair(s) — and lone pairs repel more strongly than bonding pairs — the observed molecular geometry is octahedral; the S bond angle is set to 90° rather than the ideal value for the electron-domain geometry.

Repulsion hierarchy

A useful VSEPR approximation is: lone pair–lone pair repulsion > lone pair–bonding pair repulsion > bonding pair–bonding pair repulsion. With 0 lone pair(s) on S, the lone-pair domains occupy positions that minimize overall repulsion while pushing the bonding domains (and therefore the bonded atoms) closer together.

Hybridization & Formal Charge

In the conventional localized-bond model, S uses sp3d2 hybrid orbitals to form the 6 equivalent electron-domain directions (6 bonding + 0 lone pair).

Formal-charge check

Formal charge on central S = V − N − ½B = 6 − 0 − ½×12 = 0. The preferred Lewis structure carries zero formal charge on the central atom (and on the terminals), so it is the dominant contributor.

Modeling Note Modeling Note: sp3d2 / sp3d2 hybridization is a convenient localized-bond teaching model. Modern quantum-chemical descriptions of hypervalent Sulfur hexafluoride use molecular orbitals and do not require populated d orbitals as the primary bonding picture.

Is Sulfur hexafluoride Polar or Nonpolar?

Sulfur hexafluoride is nonpolar. Although individual S–terminal bonds are polar when the atoms differ in electronegativity, the octahedral geometry makes their vector sum zero, so there is no net molecular dipole.

Expert Quote — Structural Chemistry Perspective

A common misconception is that polar bonds guarantee a polar molecule. Sulfur hexafluoride shows the opposite: identical bond dipoles arranged with octahedral symmetry cancel exactly, yielding a nonpolar species.

Interpretation consistent with standard VSEPR / molecular-geometry references.

Its nonpolar character governs solvation and intermolecular behavior; specify grade and handling when sourcing.

Structural Comparison Table

Species	Formula	Central Atom	Electron Domains	Molecular Geometry	Polarity
Sulfur hexafluoride	F₆S	S	6	octahedral	Nonpolar
Sulfur dioxide	SO₂	S	3	bent	Polar
Sulfur trioxide	O₃S	S	3	trigonal planar	Nonpolar
Sulfur tetrafluoride	F₄S	S	5	seesaw	Polar
Sulfate	O₄S	S	4	tetrahedral	Nonpolar
Sulfite	O₃S	S	4	trigonal pyramidal	Polar

Practice question Starting from the 48 valence electrons of F₆S, draw the Lewis structure and confirm the central S atom is sp3d2-hybridized with octahedral geometry. What happens to the bond angle if one terminal atom is replaced by a more electronegative substituent?

Looking for industrial bulk or specified-grade supplies of Sulfur hexafluoride (CAS 2551-62-4)? Browse Supplier on Guidechem →

FAQs

Is F₆S polar or nonpolar?

Sulfur hexafluoride is nonpolar. Its octahedral symmetry cancels the bond dipoles exactly.

What is the Lewis structure of Sulfur hexafluoride?

S–F single bond, S–F single bond, S–F single bond, S–F single bond, S–F single bond and S–F single bond; no lone pairs on S. It uses all 48 valence electrons and the preferred structure carries zero formal charge on the central atom.

What is the bond angle in Sulfur hexafluoride?

The S angle is about 90°. Lone-pair repulsion compresses the angle from the ideal octahedral value.

What is the hybridization of S in Sulfur hexafluoride?

The conventional model is sp3d2. Sulfur hexafluoride has 6 electron domains around the central S.

What is the CAS number of Sulfur hexafluoride?

The CAS number is 2551-62-4. PubChem (CID 17358) and NIST identify this with F₆S; use it to locate suppliers and database records.

References

PubChem CID 17358, Sulfur hexafluoride. Molecular formula, CAS number, molecular weight and chemical identity.
NIST Chemistry WebBook, SRD 69, Sulfur hexafluoride. Formula, CAS Registry Number and thermochemical / spectroscopic data.
IUPAC Gold Book. Definitions for "lone pair", "VSEPR", "hybridization" and "formal charge".
Atkins, P. & de Paula, J., Physical Chemistry. VSEPR, molecular geometry and dipole moments.
Guidechem supplier & dictionary records. Commercial sourcing and CAS-linked property pages for Sulfur hexafluoride (CAS 2551-62-4).

Technical scope: Lewis structures, VSEPR and hybridization are model-based descriptions for chemical communication and structure prediction; actual molecular electronic structure is more accurately represented by molecular-orbital and quantum-chemical methods. Commercial grades vary substantially by supplier and intended use; CAS 2551-62-4 identifies the substance, not a universal purity specification.

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Sulfur hexafluoride Lewis Structure