Answer:
i'm pretty sure it's beryllium
Explanation:
 
        
                    
             
        
        
        
a. 381.27 m/s
b. the rate of effusion of sulfur dioxide = 2.5 faster than nitrogen triiodide
<h3>Further explanation</h3>
Given
T = 100 + 273 = 373 K
Required
a. the gas speedi
b. The rate of effusion comparison
Solution
a. 
Average velocities of gases can be expressed as root-mean-square averages. (V rms)  

R = gas constant, T = temperature, Mm = molar mass of the gas particles  
From the question  
R = 8,314 J / mol K  
T = temperature  
Mm = molar mass, kg / mol  
Molar mass of Sulfur dioxide = 64 g/mol = 0.064 kg/mol

b. the effusion rates of two gases = the square root of the inverse of their molar masses:  

M₁ = molar mass sulfur dioxide = 64
M₂ =  molar mass nitrogen triodide = 395

the rate of effusion of sulfur dioxide = 2.5 faster than nitrogen triodide
 
        
             
        
        
        
Answer:
Five
Explanation:
All group 15 elements have five valence electrons, but they vary in their reactivity.
 
        
             
        
        
        
Answer:
Explanation:
The arrow symbol in a chemical equation separates the reactants from products. A chemical reaction is process in which chemical changes leads to the formation of products from reactants.
 
        
                    
             
        
        
        
It is not balanced since there are 2 Cl molecules on the left side, and only 1 on the right side. In order to balance this, you would need to make sure there are the same amount of all the molecules on both sides...
4Na + 2Cl2 = 4NaCl
Hope this helps :)