Rectangle Hotel Model 

1. Draw rectangles with lines for floors (see example on Bonds chapter content page).  Ground floor is the first electron shell. Second floor is the atom’s second shell. Third floor, if needed, is the atom’s third electron shell.

2. Draw squares on the Top atomic number is the number of electrons the atom has. Draw electrons on the electron shells from inner shells to outer shells. First shell holds 2 electrons. Second and third shells each hold 8 electrons. 

3. Atoms want their outer shell to be full. Draw the atoms before the bond. Write how many electrons each atom wants to give or get. 

4. Draw atoms after the bond. If the atoms both want to get electrons, draw ovals around their shared electrons. This is called a covalent, or sharing, bond. 

5. If one atom want to get electrons and the other atom want to give electrons, electrons jump between atoms. This is called a ionic bond.

6. Draw atoms after an ionic bond. Draw the charge on each atom. Draw arrows showing how these opposite charges make the ionic atoms stick together.