Name: _____________________


Complete the table by filling in the missing information.

name1) boron2)3)4)
atomic #   
# protons  
# neutrons    
total # electrons    
# electrons in 1st shell    
# electrons in 2nd shell    
# electrons in 3rd shell    
# valence electrons    

Answer question #1-8 on separate paper.

  1. Draw Bohr diagrams for the following atoms. Label energy shells as n=1, n=2, etc.
    a) beryllium     b) sulfur

  2. Draw Lewis dot diagrams for the following atoms.
    a) phosphorus     b) boron

  3. Re-draw the 3 molecules given in class. Then draw partial charges (deltas) over the appropriate atoms. Also state whether the molecule as a whole is polar or non-polar.


  4. a) How many protons does an Mg2+ ion have?

  5. b) How many electrons does an Mg2+ ion have?
    c) How many neutrons does an Mg2+ ion have?

  6. Consider a molecule with 2 carbon atoms joined by a double bond. How many hydrogen atoms does the molecule need so that each carbon has a complete octet? Make a sketch of the molecule showing all atoms and bonds.

  7. Draw the structural formula for ONE molecule which contains all the atoms listed below. Use any combination of single, double, and triple bonds so long as each atom has the correct number of bonds.
      5 carbon atoms, 1 nitrogen atom, 3 oxygen atoms, 2 chlorine atoms, as many hydrogen atoms as needed.

  8. Draw the structural formula for ONE molecule that includes all three of these functional groups in it: hydroxyl, carboxyl, amide. Circle and name the functional groups.

  9. Only polar (or charged) substances dissolve well in water. Tell whether each of the following will or will not dissolve well in water.
      a) Cl-b) glucosec) H-Hd) O2e) HFf) H2O