Electrons and the Periodic Table                                                        Name _________________

                                                                                               

1.             What is a valence electron?_______________________________________________

   

                 _____________________________________________________________________

 

2.      How  many energy  levels do the atoms of each of the following elements have?

 

       Li  _______               Si  3                          Au  _______                           Fr_______

 

        Ca  _______             Pm _______              U  _______                          He _______

 

3.      How many valence electrons do each of the following atoms have?

 

        Ca  _______             Pb     4                      Br  _______                            P  _______

 

        K _______               He _______              O   _______                          Al _______

 

4.      Which element has atoms with...

                seven valence electrons in the fourth energy level?    Br

 

                two valence electrons in the seventh energy level?__________

 

                four valence electrons in the third energy level?___________

 

                one valence electrons in the sixth energy level?___________

 

                five valence electrons in the fourth energy level?__________

 

                eight valence electrons in the fifth energy level?__________

 

5.      What is ionization energy?  _______________________________________________________

 

        _______________________________________________________________________________

 

6.     In each of the following pairs tell which atom would be the hardest to remove an electron from:

 

        Li    or   K ________                                   Mg   or  Cl      Cl                                    O or  Cs ________

 

        Sn or  Te________                                     Ne or  Rn________                               S or K ________

 

7.      Why does ionization energy increase as you go from left to right across  the periodic table? 

 

_____________________________________________________________________________

 

                ______________________________________________________________________________

 

8.      Why does ionization energy decrease as you go down the periodic table?

 

         ________________________________________________________________________________

 

         ________________________________________________________________________________

 

 

9.     In each of the following pairs tell which atom would have the largest radius:

 

        Li    or   K ________          Mg   or  Cl________     O or  Cs ________             S or K ________

 

10.           Why do atoms get bigger as you go down the periodic table?

 

                Hint:  what are you adding to the atoms with each row on the periodic table

 

11.           Why do atoms get smaller as you go from left to right on  the periodic table?

 

                Hint: how does the nucleus change as you go across the periodic table?

 

Identify each of the following as either: alkali metal, alkaline earth metal, halogen, or  noble gas

 

12.           A colorful gas that burns your eyes and throat: ________________________

 

13.           An atom with a valence configuration of s2:__________________________

 

14.           A colorless gas that won’t corrode metal, or sting your eyes: _______________________

 

15.           An element that has an unpaired s electron: _____________________

 

16.           Has an s2 p5 configuration: _______________________

 

Identify each of the following as a:

 representative element, transition element, or an inner transition element

 

17.           Iron: ______________________________

 

18.           Sulfur: ______________________________

 

19.           Uranium: ____________________________

 

20.           An element with a partially filled f sublevel: ________________________

 

21.           An element with a partially filled d sublevel: ________________________

 

Which element has the following electron configuration

 

22.  [Ar]  4s2 3d7  _______               23. [Rn]  7s2 5f6  _______             24.   [Xe]  6s2 4f14 5d10 6p1 _______

 

For each of the following elements determine which ionization energy would be significantly higher than those preceding it.  Example:  element: Ca     answer: third

 

25.  As:      6th   because the first five electrons were removed from the valence level, but the sixth was removed from an inner energy level

 

26.  S:  ____________                        27.  Al: ____________

 

28. How many valence electrons does each element have?  A) _______       B) _______     C) ___4___

 

29.  Which of the following elements might have the ionization energies listed for element A?

(circle one)            Li            Be           B             C             N             O             F              Ne

 

30.  Which of the following elements might have the ionization energies listed for element C ?

(circle one)            Na           Mg          Al            Si            P              S              Cl            Ar

 

Si has four valence electrons and so does Element C