Bohr - Rutherford Activity
1.	Complete the following chart as you work through the investigation.  
Atomic Number	Element Symbol	Element 
Name	Number of Protons	Number of Electrons 	Mass Number	Number of Neutrons	Electron Configuration 	
1								
2								
3								
4								
5								
6								
7								
8								
9								
10								
11	Na	Sodium	11	11	23	12	2,8,1	
12								
13								
14								
15								
16								
17								
18 								
19								
20								

   b) What pattern do you see in the number of electrons moving across the periodic         table?  
2. a) Lithium and sodium both behave similarly in chemical reactions. How many        electrons do these elements have in their outer orbit? 
    b) Potassium has the same chemical behaviour as lithium and sodium. Where is         potassium found on the periodic table in relation to lithium and sodium?  
c) How many electrons do you suppose that potassium has in its outer orbit? 
3. a) Fluorine and chlorine both behave similarly in chemical reactions. How many electrons do these elements have in their outer orbit? 
b) Bromine has the same chemical behaviour as chlorine and fluorine. Where is bromine found on the periodic table in relation to chlorine and fluorine?  
c) How many electrons do you suppose that bromine has in its outer orbit? 
4. a) Helium, neon, and argon behave similarly in chemical reactions. What do you notice about the outer orbit of electrons in these elements? Hint: How many electrons did Bohr say each element could have in its outer shell? 
b) Krypton has the same chemical behaviour as helium, neon, and argon. Where is Krypton found on the periodic table in relation to helium, neon, and argon? 
c) Using your answer in 4a) as a guide, explain what you would expect to see in the outer electron orbit of Krypton.