The primary function of the build toolbar is to allow for drawing, deletion, and transmuting of individual atoms and bonds using the mouse. Setting the type of bond requires pairs of atoms to be clicked sequentially after the tool is activated. Similarly, transmuting atoms to the currently selected element and removing atoms simply involve clicking on atoms in the main view.

Table 5.3. Build Toolbar Icons

	Draw unbound atoms
	Draw chains of atoms by clicking and dragging the mouse
	Add pre-defined molecular fragments to the model
	Delete individual atoms, or hold Shift to delete all bonds attached to clicked atoms
	Change clicked atoms to the currently selected element
	Satisfy the natural valencies of all C, N, and O atoms by adding hydrogen atoms
	Add hydrogens to clicked atoms
	Set the current element to hydrogen
	Set the current element to carbon
	Set the current element to nitrogen
	Select the current element from the periodic table
N/A	The current element set by the final button (which defaults to oxygen) is set from the last element chosen in the periodic table.
	Create (or change to) a single bond between two clicked atoms
	Create (or change to) a double bond between two clicked atoms
	Create (or change to) a triple bond between two clicked atoms