Answer:
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Each column is called a group<span>. The elements in each </span>group have<span> the same number of electrons in the outer orbital. Those outer electrons are also called valence electrons.</span>
        
                    
             
        
        
        
Not sure about #6 , but i got all the other answers
 
        
        
        
Answer:
D. concentration, as the concentrations of reactants and products remain unchanged after equilibrium is reached. 
Explanation:
I put it for the test and i got right hehe