The default tool is the Increase radical , which assigns radical electrons to an atom.
The Increase lone pair tool can be selected after clicking on the black triangle in the lower-right corner of the button.
|Radical and Lone Pair Icon||Increase radical|
|Radical and Lone Pair Icon 2||Increase lone pair|
Assign a Radical Electron to an Atom
Set radicals manually with the Increase radical button on the Tools toolbar. With successive clicking on the atom, you can increase the number of the radical electrons until four. For the fifth click, all of the unpaired electrons will be removed.