How To Draw Resonance Structures In Mastering Chemistry

Task	Steps
Add an atom of one of the following elements: H, C, N, O, S, F, P, Cl, Br, I	Click the element symbol. Click in the drawing area.
Add any atom	Click . Click the element symbol in the periodic table. Click in the drawing area.
Add an atom list or not list	Click . Click either Atom List or NOT list. Click the element symbols to be listed. Click OK. Click in the drawing area.
Add an atom and its bond to an existing atom	Click the element symbol for the new atom. In the drawing, drag from the existing atom away until the symbol for the new atom is displayed under the pointer. Note If you drag to the existing atom, it is replaced by your new atom.
Add two bonded carbon atoms	Click and hold the bond button to expand it. This button displays the last selected bond type — by default, . Click . Click in the drawing area.
Add a chain of carbon atoms	Click . In the drawing, drag until the number of carbon atoms you want to insert is displayed under the pointer.
Some questions : Add an R-group	Click . Click in the drawing area. Note If is not available, add any atom and change it to an R-group. Important Right-clicking an atom and selecting + R-group attachment does not add an R-group.
Replace an atom	Click the element symbol for the new atom. Click the atom to be replaced.
Change an Atom	Note This can be used to add a query atom or R-group when those tools are not available. Right-click an atom in the drawing and click Atom properties. For Change to, select Query or R-group. Query atoms: Type the label in Atom. R-groups: For R, click and then type the R number. Click OK.
Add a bond between existing atoms	Click and hold the bond button to expand it. This button displays the last selected bond type — by default, . Click the bond type you want to use. In the drawing, drag from one atom to another. Note Some bond types are not available for all questions . If the bond does not end at an existing atom, a carbon atom is automatically added at the end of the bond.
Change a bond type or direction	Click and hold the bond button to expand it. This button displays the last selected bond type — by default, . Click the bond type you want to use. Click the bond to be changed.
Increase or decrease an atom's charge	Click or . Click an atom. Click until the correct charge is shown. Note To add a + sign between reactants, see Add a + sign in a reaction.
Some questions : Add radicals or lone pairs to an atom	Click and hold the radical / lone pairs button to expand it. This button displays the last selected item — by default, . Click either or . Click an atom. Click until the correct number of radicals or lone pairs is shown.
Some questions : Draw a curved harpoon to show the movement of electrons	Click and hold the bond button to expand it. This button displays the last selected bond type — by default, . Click and hold the electron flow button to expand it. This button displays the last selected electron flow arrow — by default, . Click either or . Drag from the source electrons (or bond) to the target atom. Note Candidate source atoms are highlighted when you move the pointer over them. If you click a source atom, it is zoomed in so you can drag the source electrons. The electron flow arrow points to an incipient bond between the atoms. Click the electron flow arrow to toggle its target between the incipient bond and the target atom.