An atom<span> with a neutral </span>charge<span> is one where the number of electrons is equal to the </span>atomic<span> number
hope i helped</span>
        
                    
             
        
        
        
I believe it is C hope i helped!
        
                    
             
        
        
        
b) 4m/s/s 
This is because you divide the speed you reach, by the time it takes to get to that speed:
12m/s ÷ 3s = 4m/s/s
The units come from what you divide, meters per second ÷ seconds this can be written as m/s/s or ms-² 
 
        
                    
             
        
        
        
Answer:
(a) Most reactive  Metal B
       Metal B
 Metal D
                                    Metal D
 Metal A
                                    Metal A
Least reactive  Metal C
           Metal C
(b) (i) Bubbles should form very slowly
(ii) No reaction takes place
Explanation:
(a) The given metals arranged in their order of reactivity are;
Most reactive  Metal B
       Metal B
 Metal D
                               Metal D
 Metal A
                               Metal A
Least reactive  Metal C
      Metal C
The other of reactivity is based on the nature of their reactivity of the metals in air
(b) (i) Based on the reactivity of the metals in air, whereby metal A reacts very slowly and an oxide is formed, we have that, based on the reactivity of the metal A, when mixed with dilute hydrochloric acid, bubbles should form very slowly
(ii) Similarly, given that metal C is unreactive, we have that when small pieces of metal C are added to dilute hydrochloric acid, no reaction takes place.
 
        
             
        
        
        
The answer would be a speed