The answer is 2) 12      '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
        
             
        
        
        
ADP has two phosphate groups and ATP has three phosphate groups but they both have phosphate groups.
        
             
        
        
        
Among the most obvious differences between pseudoscorpions and scorpions is size. Scorpions range from a half-inch long to more than 7 inches; many of the commonly encountered scorpions in the United States are 2 inches long or longer, making them easy to spot with the naked eye. Pseudoscorpions, on the other hand, reach between just under one-tenth of an inch to barely over a quarter-inch long, making them inconspicuous in most circumstances. Most are under 1/8 inch.
        
             
        
        
        
False, because 
<span>According to 2n^2 rule </span>
<span>n=2 contains 8 electrons </span>
<span>n=3 contains 18 electrons </span>
<span>add electrons to have a stable octet in its outer energy level </span>