Now, to revert to the ethanol molecule, we first remove the new doubly-bonded oxygen atom, and then add one hydrogen atom.
Click once on the doubly-bonded oxygen atom to select it Press the backspace key to delete it Select the H-tool Click once on the carbon atom connected to the oxygen
Note that this way you started bonding mode again, as indicated by the bond to the mouse position.
Click once in empty space to make a hydrogen atom (connected to the carbon!) Click once on the just created atom to stop bonding Repeat this to add a second hydrogen to the carbon atom Pre-optimize the molecule
Once again you have created an ethanol molecule.
