The atomic number is the number of protons. So, you can subtract the atomic number from the mass number to find the number of neutrons.
I hope this helps! :)
        
             
        
        
        
Answer:
c
Explanation:
 cuz its informing the length of 5 and weight on 20N 
 
        
             
        
        
        
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That depends on how far it is from the nearest planet. If it's on the surface of Earth, it weighs (19 kg) x (9.8 m/s^2) = 186.2 newtons.