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To determine whether Oxygen atom (O) is polar or nonpolar, the decisive question is whether the bond dipoles of the molecule cancel once its three-dimensional shape is taken into account. Oxygen atom is an elemental substance of oxygen. As set out in the O Lewis Structure Guide, O has 1 heavy atom.
The bond polarities follow from electronegativity. As a result, the substance is an element, so there are no bonds and no bond dipoles to sum.
For formulation and process work, the useful consequences are these: the calculated topological polar surface area is 28.5 Ų, 0 hydrogen-bond donors and 0 hydrogen-bond acceptors, the Crippen calculated partition coefficient is logP ≈ -0.12 and the calculated molar refractivity is 0.69 cm³ mol⁻¹. A negative logP indicates a net preference for the aqueous phase over octanol, which is what one expects when polar and ionisable groups dominate a small molecule.
Oxygen atom (CAS 17778-80-2) is an elemental substance of oxygen, supplied as an industrial chemical. Its polarity matters for the same reason it matters for any substance of this class: it decides which phases the material will enter, how strongly it adsorbs onto polar surfaces, and how much energy a separation will cost.
No fully curated experimental solubility or density value was retrieved for this substance from the public record used here, so the discussion below stays with calculated descriptors rather than quoting a measurement that cannot be verified. On those descriptors the compound presents 28.5 Ų of polar surface area with 0 hydrogen-bond sites.
No dilute-gas permittivity is reported here: the Debye estimate would have to inherit a dipole moment that this method does not deliver reliably for this class of compound (the method is not validated for small inorganic species of this type), and for an ionic substance the equation does not apply at all.
The structure carries no strongly polar functional group, so the intermolecular forces are dominated by dispersion rather than by dipole–dipole attraction or hydrogen bonding.
No GHS hazard statements were retrieved for this substance from the public record used here, so no classification is asserted. The applicable classification must be taken from the supplier’s safety data sheet and from the ECHA or OSHA/NIOSH tables for CAS 17778-80-2.
In short, specify Oxygen atom by assay, water content, impurity profile, packaging and transport class, and state the intended application on the enquiry. The polarity analysis above explains behaviour in use; it does not replace a specification.
The comparison below places O next to structurally related substances from the same catalogue. Dipole moments come from one consistent protocol (GFN2-xTB//MMFF94, gas phase, single conformer) and are quoted only where that protocol has been validated; where it has not, the cell says so instead of giving a number. Permittivities are dilute-gas estimates from the Debye equation, logP values are Crippen calculations, and the solubility column is a qualitative inference from the calculated descriptors rather than a measurement.
| Compound | Dipole Moment | Approx. Gas εr | log P / XlogP | Water Solubility Behavior | Industrial Sourcing |
|---|---|---|---|---|---|
| O | not applicable (element) | — | logP ≈ -0.12 | Moderate to high (inferred from logP < 0) | See supply listing |
| HO | non-zero, not quoted | — | logP ≈ -0.18 | Moderate to high (inferred from logP < 0) | See supply listing |
| HCs2O | non-zero, not quoted | — | — | Dissolves by dissociation; ionic hydration dominates | See supply listing |
| SnO2 | non-zero, not quoted | — | — | Dissolves by dissociation; ionic hydration dominates | See supply listing |
| HORb2 | non-zero, not quoted | — | — | Dissolves by dissociation; ionic hydration dominates | See supply listing |
The spread across this table is the point: composition alone does not set the polarity verdict. O sits where it does because of the balance between weak dispersion forces and the symmetry of the structure, and any of the neighbouring entries can be the better choice once the temperature, the phase and the required polarity window are fixed.
“The zero dipole of O is not a small number that happens to round to zero — it follows from symmetry, so no improvement in the calculation will move it. A calculated logP of -0.12 tells you where it will partition.”
Regulatory status is specific to the substance and to the jurisdiction, and it changes. For CAS 17778-80-2 the authoritative public sources are the ECHA registered-substance database for the EU, and the OSHA and NIOSH tables for occupational exposure in the United States.
No GHS hazard statements for this substance were retrieved from the public database used to build this article, so none are asserted here. Treat the absence of a quoted classification as an instruction to check the supplier’s safety data sheet, not as evidence that the substance is harmless.
No occupational exposure limit for this substance is quoted in this article, because none was present in the database record used here. Publishing a limit that is not on the record would be worse than publishing none: obtain the applicable value from the OSHA Z-table, the NIOSH pocket guide or the equivalent national instrument before designing the ventilation or monitoring programme.
From a compliance and sustainability standpoint, the polarity of O is a means rather than an end. It determines which solvent can replace another, how completely the substance can be recovered from a stream, and how much energy the separation will cost — so it belongs in the process justification, while the hazard classification and the exposure limits belong in the safety case.
A purchase enquiry for Oxygen atom (CAS 17778-80-2) should state the grade, assay basis, permitted impurity limits, water content, packaging, and the transport and regulatory status required for the destination market. Where the substance is used as a reagent or intermediate, the impurity profile usually matters more than the nominal percentage.
Because polarity governs phase behaviour, it also governs recovery: a exactly zero molecule is easier to strip from a non-polar stream and harder to dry than a non-polar one, and vice versa. Confirm the Guidechem supply listing for current availability and compare lots on the certificate of analysis rather than on the label alone.
Looking for commercial bulk supplies or technical documentation for Oxygen atom (CAS 17778-80-2)?
Oxygen atom is nonpolar. Its bond dipoles cancel by symmetry, giving μ = 0 D.
Because the bond dipoles are arranged symmetrically and cancel as vectors. This is an exact symmetry result, not a small measured value, and it does not depend on the accuracy of the calculation.
Whether the individual bond dipoles cancel depends on how the bonds are arranged in three dimensions. Two identical bonds pointing in opposite directions cancel; the same two bonds at an angle do not.
No permittivity is quoted: the estimate would have to inherit a dipole that this method does not deliver reliably for this class of compound.
Not in routine tabulations. Snyder P′ was developed for conventional liquid chromatographic solvents, and this substance is outside the scope of that scale. Dipole moment, calculated logP and hydrogen-bond counts are the descriptors used here instead.
No measured solubility value was retrieved for this substance, so only an inference is offered: with a calculated logP of -0.12, 0 hydrogen-bond donors and 0 acceptors, the expected behaviour is Moderate to high (inferred from logP < 0).
Grade, assay basis, water content, the declared impurity profile, packaging and the transport classification, plus the regulatory status required for the destination market. Confirm the hazard classification from the supplier’s safety data sheet, since none is asserted here.
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