You should never get upset at friends because it isn't normal to get mad at them. 
No, it's completely normal to be mad with friends. 
False. 
        
                    
             
        
        
        
the net charge of an ion is non-zero due to its total number of electrons being unequal to its total number of protons.
 
        
             
        
        
        
Satellites with g<span>eosynchronous orbits revolve around Earth in the same time it takes for Earth to rotate on its axis.</span>