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Radicals and lone pairs
Radical dots or lone pairs can be placed on atoms.
86 tools have this, 9 of them shown here. 2 do not. 40 not established.
- Tested by running it
- Seen in the app
- The manual says yes
- Partly, with the reason shown
- Not supported
- Not established, which is not the same as no
Select a mark for its proof. A filled mark opens our screenshot, or the manual if the check left nothing to picture. A ring opens the manual.
Yes, according to the manual: Atom-attached lone pairs and radical dots. MolDraw
4.0
Lone-pair dots appear on oxygen and nitrogen atoms.
Yes, according to the manual: Monoradical and diradical dots. ChemEdit
1.4.3
Radical selector in the Atom Properties dialog.
Yes, according to the manual: Computed or manually adjusted lone pairs. MolChart
v1.375
Edit menu shows add and remove lone pair commands.
Yes, according to the manual: Lone pairs are drawing annotations. Chemliora
15.19.0
Charge and electron tools include single and paired dots.
Yes, tested by running it: Oxygen radical dot and lone pair rendered. chemfig
1.82
Oxygen with a radical dot and lone pair.
Yes, according to the manual: Unpaired-electron controls; lone pairs unverified. Schrödinger Sketcher
Release 2026-4 (build 131)
Atom menu includes Add Unpaired Electron.
Yes, according to the manual: Atom properties include the number of unpaired electrons. SketchEl 2
0.1.0
Edit Atom dialog with an unpaired electron field.
Yes, according to the manual: Unpaired-electron counts represent radicals. SketchEl
1.62
Edit Molecule table includes an Unpaired column.
Yes, according to the manual: Unpaired-electron counts produce radical dots. WebMolKit
2.0.11
Edit Atom dialog with an unpaired electron setting.
Available, no screenshot
ChemDraw's license keeps us from publishing pictures of its interface.
- Yes, according to the manual: Attach radical dots and lone pairs to atoms. Opens the cited page.ChemDrawAttach radical dots and lone pairs to atoms.
- Yes, according to the manual: Atom-owned radical dots and positioned lone pairs. Opens the cited page.ReShikiAtom-owned radical dots and positioned lone pairs.Source
- Yes, according to the manual: Atom Properties sets radical electrons and drawn lone pairs. Opens the cited page.PenzeneAtom Properties sets radical electrons and drawn lone pairs.Source
- Yes, according to the manual: Atom symbol tools place radical dots and lone pairs. Opens the cited page.Octet DrawAtom symbol tools place radical dots and lone pairs.Source
- Yes, according to the manual. Opens the cited page.ChemDraftSource
- Yes, according to the manual. Opens the cited page.SketchIQSource
- Yes, according to the manual. Opens the cited page.Reactio DrawSource
- Yes, according to the manual. Opens the cited page.Chem IllustratorSource
- Yes, according to the manual: Custom toolbar provides radical and diradical tools. Opens the cited page.ChemThisTryCustom toolbar provides radical and diradical tools.Source
- Yes, according to the manual: Radical and electron-pair tools are enabled. Opens the cited page.Molecule Lab (The Freshman Mole)Radical and electron-pair tools are enabled.Source
- Yes, according to the manual: Monoradical and singlet/triplet diradical atom properties. Opens the cited page.FreeChemDrawMonoradical and singlet/triplet diradical atom properties.Source
- Yes, according to the manual: Drawn radicals contribute to species multiplicity. Opens the cited page.vibe-sketcherDrawn radicals contribute to species multiplicity.Source
- Yes, according to the manual: Radical and lone-pair placement on atoms persists in drawings. Opens the cited page.ErezDrawRadical and lone-pair placement on atoms persists in drawings.Source
- Yes, according to the manual. Opens the cited page.MolCanvasSource
- Yes, according to the manual: Monoradical and singlet/triplet diradical atom properties. Opens the cited page.KendrawMonoradical and singlet/triplet diradical atom properties.Source
- Yes, according to the manual: Monoradical and singlet/triplet diradical states. Opens the cited page.BoltzDrawMonoradical and singlet/triplet diradical states.Source
- Yes, according to the manual: Radical setting in Ketcher's atom properties. Opens the cited page.MolbrettRadical setting in Ketcher's atom properties.Source
- Yes, according to the manual: Automatic and manually positioned lone pairs. Opens the cited page.Zeanium Molecule DrawerAutomatic and manually positioned lone pairs.Source
- Yes, according to the manual: Atom radical dots and electron-pair modifiers. Opens the cited page.Sciformation VectorMolAtom radical dots and electron-pair modifiers.Source
- Yes, according to the manual: Tools add and remove radicals and lone pairs. Opens the cited page.ChemDoodle Web ComponentsTools add and remove radicals and lone pairs.Source
- Yes, according to the manual: Ketcher offers monoradical and singlet/triplet diradical settings. Opens the cited page.Chemeditor (Chemrise)Ketcher offers monoradical and singlet/triplet diradical settings.Source
- Yes, according to the manual: Toggle one or two radical electrons on an atom. Opens the cited page.MoleditPyToggle one or two radical electrons on an atom.Source
- Yes, according to the manual: Dedicated radical and lone-pair tools. Opens the cited page.ChemCanvasDedicated radical and lone-pair tools.Source
- Yes, according to the manual: Lone pairs and unpaired electrons can be edited. Opens the cited page.MolView.comLone pairs and unpaired electrons can be edited.Source
- Yes, according to the manual: Mono- and diradical states are available. Opens the cited page.KetcherMono- and diradical states are available.Source
- Yes, according to the manual: Atom properties include mono- and diradical states. Opens the cited page.AI Chemical Drawing (CubicZnS)Atom properties include mono- and diradical states.Source
- Yes, according to the manual: Lone-pair tool also supports single-electron dots. Opens the cited page.OpenReactionsLone-pair tool also supports single-electron dots.Source
- Yes, according to the manual: Atom tools add lone pairs and charged radical dots. Opens the cited page.PyChem-ProAtom tools add lone pairs and charged radical dots.Source
- Yes, according to the manual: Monoradical and singlet/triplet diradical atom settings. Opens the cited page.KetchDrawMonoradical and singlet/triplet diradical atom settings.Source
- Yes, according to the manual: Dedicated Radical mark tool. Opens the cited page.ChemvasDedicated Radical mark tool.Source
- Yes, according to the manual. Opens the cited page.MolsketchSource
- Yes, according to the manual: Radical dots can be toggled on hovered atoms. Opens the cited page.ChemableRadical dots can be toggled on hovered atoms.Source
- Yes, according to the manual. Opens the cited page.WaveSpeed AI Chemical Structure DrawerSource
- Yes, according to the manual: Radical dots and atom-localized, rotatable electron pairs. Opens the cited page.cDrawRadical dots and atom-localized, rotatable electron pairs.Source
- Yes, according to the manual: Single radicals, paired dots and lone-pair bars. Opens the cited page.BondCraftSingle radicals, paired dots and lone-pair bars.Source
- Yes, according to the manual: Single-electron radicals can be added and removed. Opens the cited page.JChemPaintSingle-electron radicals can be added and removed.Source
- Partly: API controls calculated lone pairs; no manual placement tool. Opens the cited page.Molsoft HTML5 Molecule EditorAPI controls calculated lone pairs; no manual placement tool.Source
- Yes, according to the manual. Opens the cited page.ChemSemaSource
- Yes, according to the manual: Hotkeys set single-electron, singlet and triplet radical states. Opens the cited page.OpenChemLib JS editorHotkeys set single-electron, singlet and triplet radical states.Source
- Yes, according to the manual: Radical states and lone-pair electron markers. Opens the cited page.Kekule.jsRadical states and lone-pair electron markers.Source
- Yes, according to the manual: Graphical electron-dot and lone-pair symbols. Opens the cited page.XDrawChemGraphical electron-dot and lone-pair symbols.Source
- Yes, according to the manual: Editable radical states render as dots or rings. Opens the cited page.ChemifreeEditable radical states render as dots or rings.Source
- Yes, according to the manual: Mono- and diradical atom settings. Opens the cited page.Ketcherails (ketcher-rails)Mono- and diradical atom settings.Source
- Yes, according to the manual: Singlet, doublet and triplet radicals have editable atom settings. Opens the cited page.JMolDrawSinglet, doublet and triplet radicals have editable atom settings.Source
- Yes, according to the manual: Lone pairs use text strokes around element symbols. Opens the cited page.Chemeditor (Chemie-Lernprogramme)Lone pairs use text strokes around element symbols.Source
- Yes, according to the manual: Radical editing in ChemWriter 3.15.1; older deployments differ. Opens the cited page.ChemWriterRadical editing in ChemWriter 3.15.1; older deployments differ.Source
- Yes, according to the manual: Radical, biradical and electron-pair marks. Opens the cited page.BKChem Python 3 ModernizedRadical, biradical and electron-pair marks.Source
- Yes, according to the manual. Opens the cited page.ChemDoodle 2DSource
- Yes, according to the manual: Lone-pair and radical tools update individual atoms. Opens the cited page.LabCanvas Figure Editor / MolDrawLone-pair and radical tools update individual atoms.Source
- Yes, according to the manual: Radical types can be assigned to individual atoms. Opens the cited page.Marvin Desktop Suite / MarvinSketchRadical types can be assigned to individual atoms.Source
- Yes, according to the manual: Atom-associated radical dots and lone-pair markers. Opens the cited page.ChemDraft (元素智研)Atom-associated radical dots and lone-pair markers.Source
- Yes, according to the manual: Radical electrons and lone pairs can be assigned manually. Opens the cited page.Marvin JSRadical electrons and lone pairs can be assigned manually.Source
- Yes, according to the manual: Radical, biradical and lone-pair marks. Opens the cited page.BKChemRadical, biradical and lone-pair marks.Source
- Yes, according to the manual: Dedicated radical tools; electron-pair tools also available. Opens the cited page.ChemWindow (KnowItAll ChemWindow Edition)Dedicated radical tools; electron-pair tools also available.Source
- Yes, according to the manual: Atom Properties includes a radical selector. Opens the cited page.Chemistry DrawAtom Properties includes a radical selector.Source
- Yes, according to the manual. Opens the cited page.Zoho ChemStudioSource
- Yes, according to the manual. Opens the cited page.GChemPaintSource
- Yes, according to the manual. Opens the cited page.KingDrawSource
- Yes, according to the manual: Attach horizontal or vertical lone pairs to atoms. Opens the cited page.ACD/ChemSketchAttach horizontal or vertical lone pairs to atoms.Source
- Yes, according to the manual: Radical dots, paired dots, and electron-pair marks. Opens the cited page.Ferrum Chemical ForgeRadical dots, paired dots, and electron-pair marks.Source
- Yes, according to the manual: Explicit add-radical drawing tool. Opens the cited page.Marvin CloudExplicit add-radical drawing tool.Source
- Yes, according to the manual: Electrons and lone pairs can be added to atoms. Opens the cited page.Chem4WordElectrons and lone pairs can be added to atoms.Source
- Yes, according to the manual: Atom inspector includes radical settings. Opens the cited page.AtomLensAtom inspector includes radical settings.Source
- Yes, according to the manual: Keypad creates lone pairs; individual dots can represent radicals. Opens the cited page.ChemtoolKeypad creates lone pairs; individual dots can represent radicals.Source
- Yes, according to the manual: Radical and lone-pair placement tools. Opens the cited page.LhendrawRadical and lone-pair placement tools.Source
- Yes, according to the manual: Atoms have a documented radical property. Opens the cited page.JSDrawAtoms have a documented radical property.Source
- Yes, according to the manual: Lone pairs can be positioned automatically or manually. Opens the cited page.MoleculeSketchLone pairs can be positioned automatically or manually.Source
- Yes, according to the manual: Displays lone pairs on atoms. Opens the cited page.FX ChemStruct / FX Draw Chemical StructuresDisplays lone pairs on atoms.Source
- Yes, according to the manual: Radical dots can be added to atoms. Opens the cited page.BondDrawRadical dots can be added to atoms.Source
- Yes, according to the manual. Opens the cited page.ChemGraphic 2Source
- Yes, according to the manual: Radical, lone-electron and lone-pair ornaments attach to atoms or bond ends. Opens the cited page.EasyChemRadical, lone-electron and lone-pair ornaments attach to atoms or bond ends.Source
- Yes, according to the manual: Lone electron pairs are drawn automatically. Opens the cited page.MyChemiseLone electron pairs are drawn automatically.Source
- Yes, according to the manual: Pro; vendor claim: lone pairs. Opens the cited page.Chem+ Molecular Structure EditorProPro; vendor claim: lone pairs.Source
- Yes, according to the manual: Shared sketcher supports setting atom radical counts. Opens the cited page.MolPrime+Shared sketcher supports setting atom radical counts.Source
- Yes, according to the manual. Opens the cited page.ChemScribbleSource
- Yes, according to the manual: Vendor claim: lone-pair markers. Opens the cited page.StructoVendor claim: lone-pair markers.Source
- Partly: Automatic electron dots; manual radical or lone-pair placement unverified. Opens the cited page.moledAutomatic electron dots; manual radical or lone-pair placement unverified.Source
Not available
- No: Radicals remain on the roadmap. Opens the cited page.Chemical Structure Editor (CSE)Radicals remain on the roadmap.Source
- No: Radical button clicks produced no visible atom change. Opens the cited page.MCDL Java Chemical Structure EditorRadical button clicks produced no visible atom change.Source
Not established (40)
Covalent, Chematic Draw, BondForge, Molecule Builder (OvOHongYu), Molecule Clipboard, MolGLideX, SketchScape, Structura (chem-structura), MolSketch, Dotmatics Elemental / Elemental Draw, JSME Molecule Editor, RadSketch, Butlerov, schematic, ChemMD, rdEditor, ChemCanvasJS, Kemia, MolTouch, SketChem, vue-chemdraw (0chem), Glass, molsketch-cljs, MolPad, InDraw, BIOVIA Draw, ChemPencil, ChemCAD, Chemistry 4-D Draw, ChemStitch, MolSketchGo, CyBy-Draw, Elk_Draw RDKit, MolGenDraw, Chirys Draw, Chem Sketcher (Non_REM.Persona Laboratory), Chemograph Plus, alvaSketcher, ChemWorks, Molecule