Homework Set 3

1.  Rank the types of light below from the least frequency to the greatest frequency.
            ultraviolet          red          x-ray          infrared          microwave  
            <                         <                       <                        <

2.  What fundamental, new idea did Bohr’s model of the atom contribute that paved the 
     way for the modern model of the atom?

3.  Suppose an atom has four energy levels.  Based on the Bohr model of the atom, how many
      emission lines should theoretically be observed?  Draw a diagram to illustrate all these
      transitions; use arrows to indicate each transition between two levels.

4.   a)  What is the shape of an “p” orbital? ____________________

      b)  How many electrons can each "p" orbital hold? ________  

      c)  How many electrons can fill into all the "2p" orbitals? ________

5.  Why do atoms in the same column/family/group of the periodic table have similar 
chemical properties?

 

6.  What do the orbitals in a period/ row/series have in common that determines the 
appearance of the periodic table.
 

7.   a)  Which atom has the electron configuration 1s²2s²2p³?____________ 

b)  How many valence electrons does it have?_________

8.     a)  Write the (ground state) electron configuration for a nickel atom below.


b)  How many unpaired electrons exist in this ground state nickel atom? ______

9.  What is the effective nuclear charge for an electron in the outermost shell of an oxygen atom?

10.  Which is a larger atom, Li or Ne?  Explain why.  (Do not just state relative locations, give a reason.)  

11.  What atom has the ground state electron configuration 1s²2s²2p⁶3s²3p⁶4s²3d⁶?________

12.  How many unpaired electrons exist in the ground state of a oxygen atom?

13.  What is the ground state electron configuration for a nitride ion (N^3-)?

14.  What is the name of the compound with the formula Na₂S?

15.  Write the electron-dot symbol for aluminum.

16.  Magnesium and chlorine combine to form a compound with the formula _________.

17.  Calcium forms a stable ion with a _______ (sign & magnitude) charge.  Ions with this type 
      of charge are generally referred to as _________.

18.  “Simple” ionic compounds are made by combining two types of elements to form a new
       compound.  Name the two types of elements required:
              (i)                                   (ii)