Name:

Using the Periodic Table

Complete the charts below using your notes and your periodic table.

Note 1: The mass number for the most abundant isotope is found by rounding the atomic mass.

Element name Element symbol Atomic number Average Atomic mass Mass number of most abundant isotope # of protons # of neutrons # of electrons in an atom with neutral charge
carbon
 

 

 

 

 

 

 
oxygen
 

 

 

 

 

 

 
  Ca
 

 

 

 

 

 
 
 

 

 

 
24
 

 
  Fe
 

 

 

 

 

 
 
 

 

 

 

 

 
50
  Au
 

 

 

 

 

 
 
 
82
 

 

 

 

 
 
 

 
238.03
 

 

 

 
 
Element name Element symbol Period # of e- shell Group # of e- in outermost shell
carbon
 

 

 

 

 

 
Si
 

 

 

 

 

 
5
 
7A
 

 

 

 
4
 
5

 

 
3
 

 
3
 

Answer these questions in complete sentences.

  1. What pattern have we observed in the electron configuration of elements in a group?
  2. What pattern have we observed in the electron configuration of elements in a period?
  3. What is more important to the chemical reactivity of elements: the number of the electron shell being filled or the number of electrons in that shell?
  4. What evidence do you have to support your answer above?
  5. Something unusual happens in period 4 as you move left to right through the groups, filling the electron shells with electrons. Describe how the pattern is different from that in periods 1, 2 and 3.
  6. What do the elements scandium, chromium and copper have in common? Be specific. Hint: how did you answer the question above?