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How to convert between Lewis structures and bond-line

Select the structure and choose Object › Chemistry › Convert to Lewis structure. Every carbon, hydrogen and lone pair is drawn. Object › Chemistry › Convert to bond-line goes back.

Steps

  1. Select the structure, for example ethanol.

  2. Choose Main menu › Object › Chemistry › Convert to Lewis structure. Every carbon and hydrogen is written out and the lone pairs are drawn on the heteroatoms.

    Ethanol as a Lewis structure, with every H and the two lone pairs on O.Ethanol as a Lewis structure, with every H and the two lone pairs on O.

  3. To go back, select it and choose Main menu › Object › Chemistry › Convert to bond-line.

Atoms, bonds and ringsHow to add charges, radicals and lone pairsPress Q for the Charges tool, pick plus (+), minus (-), lone pair (L), radical, diradical, delta plus or delta minus, and click the atom. clear takes every mark off an atom.MechanismsHow to draw curved arrows for a mechanismPress W, then 7 for a curly arrow (an electron pair) or 8 for a fishhook (one electron). Drag from a lone pair or a bond to the atom or bond the electrons go to.

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Last updated Nov 12, 2026