<span>d. tightly packed particles</span>
        
                    
             
        
        
        
The density can be calculated using the following rule:
density = mass/volume
therefore,
volume = mass/density
we have the mass=22 mg=0.022 grams and density=0.754g/cm^3
substituting in the above equation, we can calculate the volume as follows:
volume = 0.022/0.754 = 0.0291 cm^3
        
             
        
        
        
Answer:
Noble gases.
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