Answer: The answer is A 
Explanation: No because it’s is a mixture because physical methods were used to separate its particals
 
        
             
        
        
        
<span>#1 is air radon, #2 is x-ray, #3 is ground, #4 is cosmic radiation, #5 is TV tube, #6 is weapons test fallout . That's all I got hope I helped!</span>
        
                    
             
        
        
        
Answer:
this is your answer
Explanation:
Silicon, like carbon, is relatively inactive at ordinary temperatures; but when heated it reacts vigorously with the halogens (fluorine, chlorine, bromine, and iodine) to form halides and with certain metals to form silicides.
hope it helps
good day (≧▽≦)
 
        
                    
             
        
        
        
As metal + acid will form hydrogen gas and salt , the chemical equation is : 
Mg + 2HCl --> H2 + MgCl2