Answer:
119836.8 km
Explanation:
   74 898 miles *  1.6 km / mile = 119836.8 km
 
        
             
        
        
        
Magnesium(?)
<span>2 HCl + Mg ? MgCl2 + H2</span>
        
                    
             
        
        
        
<span>Higher energy = shorter wavelength 
Frequency is one cycle over an amount of time (seconds) 
So higher frequency = higher energy = shorter wavelength</span>
        
                    
             
        
        
        
Here I found some info at Yahoo answers: https://answers.yahoo.com/question/index?qid=20090119191941AAB7oAb
The more electronegative an atom is the more unwilling it is to lose its electrons in a compound. If you do try to take a very EN atom away from a compound you'll need to apply a lot of energy for that to happen. I can give an example of a single atom though 
<span>Cl has 7 valence electron filled and every atom wants to be like nobles (noble gases), so it's not going to give an electron away b/c it's really close to being like a noble gas. Noble gases are the most stable atoms, which is why I say stability counts.</span>