The answer is 9 because to find the amount of neutrons you have to take away the atomic number from the mass
        
             
        
        
        
The periodic table only accounts for elements.  It does not account for compounds, such as water.
 
        
                    
             
        
        
        
No, it is impossible for it to produce the exact result
        
                    
             
        
        
        
Answer:
Vaccination/Vaccine
Explanation:
Vaccination/Vaccine: The process of using a dead or weakened version version of a microbe to gain antibodies, thus protecting against future infections without needing to have the disease first.
Bacteriophage: A virus that infects bacteria.
Antibiotics: Medicines are used to treat bacterial infections by killing the bacteria, and do not work on viruses.
Pathogenic: capable of causing disease.