Answer is B, because CaSO3 only has one S
        
             
        
        
        
True, an atoms nucleus has both protons and electrons.
        
             
        
        
        
Answer:
A
Explanation:
Sodium has 11 electrons and Magnesium has 12 electrons. Since here you need to consider atoms, they must have equal amount of protons as electrons to be considered neutral, and so an atom. 
So simply 11+12 =23
 
        
             
        
        
        
The answer is longitudinal waves more particles at right angles
        
             
        
        
        
Hello There!
The frequency is 91.74 MHz.
It is UltraViolet Radiation.
Hope This Helps You!
Good Luck :)