It tells you how many protons it has and because the number of protons =electrons it tells you also the number of electrons.
        
             
        
        
        
The sample with the lowest AVERAGE kinetic energy is 
the coolest one.
The sample with the lowest TOTAL kinetic energy depends on
not only the temperature of the samples, but also on their size,
since each molecule in the sample has kinetic energy.
        
             
        
        
        
Answer:
the normality of the given solution is 0.0755 N
Explanation:
The computation of the normality of the given solution is shown below:
Here we have to realize the two sodiums ions per carbonate ion i.e.
N = 0.321g Na_2CO_3 × (1mol ÷ 105.99g)×(2eq ÷ 1mol)
= 0.1886eq ÷ 0.2500L
= 0.0755 N
Hence, the normality of the given solution is 0.0755 N
 
        
             
        
        
        
[Ar] 4s² 
Let me know if you want a step by step!
Hope that helps