It is an element. Aluminun foil is aluminum prepared in thin leaves.
        
                    
             
        
        
        
Hi there
In order for an electron to jump into a higher energy state, it must first absorb energy (heat, light, etc).
When an electron goes back down to the ground state from the excited state, it emits energy usually in the form of a photon.
i hope this helps
 
        
        
        
Answer:
The answer is B. Atomic Mass
 
        
                    
             
        
        
        
Below is the mechanism showing the hydrolysis of Iminium Ion into aldehye. The arrows are shown in RED.