A.
Physical change 
Step by step explanation;:)
        
                    
             
        
        
        
Ca2+ would bond to any element in a 1 to 1 ratio that had an equal and opposite charge. 
Neon is a noble gas, and doesn’t form bonds m
Carbon isn’t typically found in ion state, but if it did, it would likely by C4+
Flouring in ionic state is F1-, so you would need 2 flourines to cancel the 2+ charge of Calcium 
Then the only option left would be Oxygen which, when in ion form is found be 2-
        
                    
             
        
        
        
Answer:
This means that waves need a medium to propagate, but light waves propagate where no particles are present. ...
 
        
             
        
        
        
Answer:
A. Chemical name
Explanation:
The Chemical Name is the name generated by applying the naming conventions of the International Union of Pure and Applied Chemistry (IUPAC). The correct names of compounds contained in drug products can be formed by implementing these rules