
1 
The electron configuration for argon is: 



1s^{2}2s^{2}2p^{6}3s^{2}3p^{6} 



1s^{2}2s^{2}2p^{6}3s^{2}3d^{6} 



1s^{2}2s^{2}2p^{6}3p^{6}3d^{2} 



1s^{2}2s^{2}2p^{6}3s^{8} 



None of the previous answers. 

2 
The electron configuration for chloride is: 



1s^{2}2s^{2}2p^{6}3s^{2}3p^{6} 



1s^{2}2s^{2}2p^{6}3s^{2}3d^{6} 



1s^{2}2s^{2}2p^{6}3p^{6}3d^{2} 



1s^{2}2s^{2}2p^{6}3s^{2}3p^{5} 



None of the previous answers. 

3 
The electron configuration for sulfide is: 



1s^{2}2s^{2}2p^{6}3s^{2}3p^{6} 



1s^{2}2s^{2}2p^{6}3s^{2}3d^{6} 



1s^{2}2s^{2}2p^{6}3s^{2}3p^{4} 



1s^{2}2s^{2}2p^{6}3s^{2}3p^{5} 



None of the previous answers. 

4 
The electron configuration for potassium ion is: 



1s^{2}2s^{2}2p^{6}3s^{2}3p^{6} 



1s^{2}2s^{2}2p^{6}3s^{2}3d^{6} 



1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1} 



1s^{2}2s^{2}2p^{6}3s^{2}3p^{5} 



None of the previous answers. 

5 
The electron configuration for calcium ion is: 



1s^{2}2s^{2}2p^{6}3s^{2}3p^{6} 



1s^{2}2s^{2}2p^{6}3s^{2}3d^{6} 



1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1} 



1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2} 



None of the previous answers. 

6 
1s^{2}2s^{2}2p^{6}3s^{2}3p^{6} is the electron configuration for: 



argon 



chloride 



sulfide 



calcium ion 



All of the previous answers. 

7 
A positive ion (cation) is formed when: 



An atom gains protons. 



An atom gains positrons. 



An atom loses electrons 



None of the previous answers 





8 
Negative ions (anions) are formed when: 



an atom loses a proton. 



an atom gains electrons. 



a double replacement reaction occurs. 



None of the previous answers. 





9 
The valence electron structure of the halogens is (n represents the number of the highest incomplete quantum level): 



ns^{2}np^{5} 



ns^{2}np^{6} 



np^{5} 



np^{7} 



None of the previous answers. 

10 
The valence electron structure of the alkaline earth metals is (n represents the number of the highest incomplete quantum level): 



ns^{2}np^{6} 



ns^{2}np^{1} 



ns^{2} 



np^{2} 



None of the previous answers. 

11 
The valence electron structure of the 6A (oxygen family) is (n represents the number of the highest incomplete quantum level): 



ns^{2}np^{6} 



ns^{2}np^{4} 



ns^{2}np^{2} 



np^{6} 



None of the previous answers. 

12 
The valence electron structure of the 3A (boron family) is (n represents the number of the highest incomplete quantum level): 



ns^{3} 



np^{3} 



ns^{2}np^{6} 



ns^{2}np^{1} 



None of the previous answers. 

13 
The valence electron structure of the 1A (alkali metals) is (n represents the number of the highest incomplete quantum level): 



ns^{1} 



np^{1} 



ns^{2}np^{6} 



ns^{2} 



None of the previous answers. 

14 
The valence electron structure of the 5A (nitrogen family) is (n represents the number of the highest incomplete quantum level): 



ns^{5} 



np^{5} 



ns^{2}np^{3} 



np^{3} 



None of the previous answers. 
